This reverts commit 16b9e6fb.

This breaks buildbots.

This adds `IntegralAP` backing the two new primtypes `IntAP` (unsigned
arbitrary-precision int) and `IntAPS` (same but signed).

We use this for `int128` support (which isn't available on all host
systems we support AFAIK) and I think we can also use this for `_BitInt`
later.

See discourse thread https://discourse.llvm.org/t/rfc-support-cmake-option-to-control-link-type-built-for-flang-runtime-libraries/71602/18 for full details.

Flang-rt is the new library target for the flang runtime libraries. It builds the Flang-rt library (which contains the sources of FortranRuntime and FortranDecimal) and the Fortran_main library. See documentation in this patch for detailed description (flang-rt/docs/GettingStarted.md).

This patch aims to:
- integrate Flang's runtime into existing llvm infrasturcture so that Flang's runtime can be built similarly to other runtimes via the runtimes target or via the llvm target as an enabled runtime
- decouple the FortranDecimal library sources that were used by both compiler and runtime so that different build configurations can be applied for compiler vs runtime
- add support for running flang-rt testsuites, which were created by migrating relevant tests from `flang/test` and `flang/unittest` to `flang-rt/test` and `flang-rt/unittest`, using a new `check-flang-rt` target.
- provide documentation on how to build and use the new FlangRT runtime

Reviewed By: DanielCChen

Differential Revision: https://reviews.llvm.org/D154869

Fixes https://github.com/llvm/llvm-project/issues/65227

LLVMGetOrdering previously did not support Fence instructions, and
calling it on a fence would lead to a bad cast as it
assumed a load/store, or an AtomicRMWInst. This would either read a
garbage memory order, or assertion

LLVMIsAtomicSingleThread did not support either Fence instructions,
loads, or stores, and would similarly lead to a bad cast.
It happened to work out since the relevant types all have their synch
scope ID at the same offset, but it still should be fixed

These cases are now fixed for the C API, and tests for these
instructions are added. The echo test utility now also supports cloning
Fence instructions, which it did not previously

-----

From what I can tell, there's no unified API to pull
`getOrdering`/`getSyncScopeID` from, and instead requires casting to
individual types: if there is a better way of handling this I can switch
to that

The newly added tests check which rounding mode is used by default, and
that it is printed when aliases are disabled but not otherwise.

These tests will be used in #67555.

* Remove if its sole use is to support an unnecessary ptr-to-ptr bitcast
  (remove the bitcast as well)
* Replace with use of other APIs.

NFC opaque pointer cleanup effort.

* Remove if its sole use is to support an unnecessary ptr-to-ptr bitcast
  (remove the bitcast as well)
* Replace with use of other APIs.

NFC opaque pointer cleanup effort.

The AArch64StorePairSuppress pass prevents the creation of STP under some
heuristics. Unfortunately it often prevents the creation of STP in cases where
it is obviously beneficial, and it doesn't match my understanding of
scheduling/cpu pipelining to prevent the creation of STP. From some
benchmarking, even on an in-order cpu where the scheduling is most important I
don't see it giving better results. In general the lower instruction count for
STP would be expected to give a slightly better cycle count.

As the pass specifically mentions the cyclone cpu, this patch adds a target
feature for FeatureStorePairSuppress, enabled for all the non-Arm cpus. This
has the effect of disabling it for all Arm cpus.

Differential Revision: https://reviews.llvm.org/D134646

To do this:
1. Protect BC.Ctx with mutex
2. Don't call exit from thread, please check the reason comment near
PassFailed variable definition. The other option would be call _Exit
instead of exit, but I think we shall call destructors properly.

Most of the print options are hidden, make hidden them all.

It always returns false in the unwrapped line parser!

After patch https://github.com/llvm/llvm-project/pull/67288 landed,
unfoldMemoryOperand would not return NewMIs whose size ==3. So the
removed line is useless.

This patch replaces any_cast with llvm::any_cast. This in turn allows
us to gracefully switch to std::any in future by forwarding llvm::Any
and llvm::any_cast to:

  using Any = std::any;

  template <class T> T *any_cast(Any *Value) {
    return std::any_cast<T>(Value);
  }

respectively.

Without this patch, it's ambiguous whether any_cast refers to
std::any_cast or llvm::any_cast.

As an added bonus, this patch makes it easier to mechanically replace
llvm::any_cast with std::any_cast without affecting other occurrences of
any_cast (e.g. in libcxx).

The goal of the class is to be an (almost) drop in replacement for
SmallVector and std::vector when those are presized and filled later, as
it happens in SourceManager and ASTReader.

By doing so, sparsely accessed PagedVector can profit from reduced 
memory footprint.

Variables that point to physical storage buffer require aliasing
decorations. This is specified by the `SPV_KHR_physical_storage_buffer`
extension.

Also add an example of a variable with a decoration attribute.

At line 191, `addSymbol` takes the name by reference but does not make
an internal copy to the string, meaning the local
`optional<std::string>` would get freed and leave Orc with a dangling
pointer. Fix this by just using an `optional<StringRef>` instead.

This patch tentatively fixes the various test failures introduced
following 0ea3d88b:

https://green.lab.llvm.org/green/view/LLDB/job/as-lldb-cmake/6316/

From my understanding, the main issue here is that we can't find some headers
when evaluating C++ expressions since those headers have been promoted
to be system modules, and to be shipped as part of the toolchain.

Prior to 0ea3d88b, the `BuiltinHeadersInSystemModules` flag for in
the clang `LangOpts` struct was always set, however, after it landed,
the flag becomes opt-in, depending on toolchain that is used with the
compiler instance. This gets set in `clang::createInvocation` down to
`Darwin::addClangTargetOptions`, as this is used mostly on Apple platforms.

However, since `ClangExpressionParser` makes a dummy `CompilerInstance`,
and sets the various language options arbitrarily, instead of using the
`clang::createInvocation`, the flag remains unset, which causes the
var...

This reverts commit 35ec6ea6.

Breaks downstream narrow type execution tests.

This partially reverts #66380. The assertion that the underlying buffer
of an EncodingReader is aligned to any required alignments for resource
sections. Resources know their own alignment and pad their buffers
accordingly, but the bytecode reader doesn't know that ahead of time.
Consequently, it cannot give the resource EncodingReader a base buffer
aligned to the maximum required alignment.

A simple example from the test fails without this:

```mlir
module @TestDialectResources attributes {
  bytecode.test = dense_resource<resource> : tensor<4xi32>
} {}
{-#
  dialect_resources: {
    builtin: {
      resource: "0x2000000001000000020000000300000004000000",
      resource_2: "0x2000000001000000020000000300000004000000"
    }
  }
```

Replace some uses of `Type::getPointerTo` via 2 ways
* Remove entirely if it's only used to support an unnecessary bitcast
  (remove the bitcast as well).
* Replace with `PointerType::get`/`PointerType::getUnqual`

NFC opaque pointer clean-up effort.

The goal in #66818 was to capture function entry counts, but those are not the same as the frequency of the entry (machine) basic block. This fixes that, and adds explicit profiles to the test.

We also increase the precision of `MachineBlockFrequencyInfo::getBlockFreqRelativeToEntryBlock` to double. Existing code uses it as float so should be unaffected.

    [MLIR] Add stage and effectOnFullRegion to side effect

    This patch add stage and effectOnFullRegion to side effect for optimization pass
    to obtain more accurate information.
    Stage uses numbering to track the side effects's stage of occurrence.
    EffectOnFullRegion indicates if effect act on every single value of resource.

    RFC disscussion: https://discourse.llvm.org/t/rfc-add-effect-index-in-memroy-effect/72235
    Differential Revision: https://reviews.llvm.org/D156087

Reviewed By: mehdi_amini, Mogball

Differential Revision: https://reviews.llvm.org/D156087

Summary:
This was disabled on the GPU because it conflicted with the definition
in `glibc`. According to information online and in the `glibc`
implementation, the first argument should be a `const void *`. Fixing
this resolves the problem when exporting this to offloading languages.

The plan is to fix memcmp interceptor in HWASAN and remove the
unsupported statement at that time.

---------

Co-authored-by: Vitaly Buka <vitalybuka@gmail.com>

The new number of elements should be the original one divided by a scale
factor computed from old and new bit width.

Summary:
The POSIX standard expects the first argument to this function to be
constant, e.g. https://man7.org/linux/man-pages/man2/nanosleep.2.html.
This fixes that problem and also corrects an obvious problem with
enabling this for offloading.

Context
BoundsSanitizer is a mitigation that is part of UBSAN. It can be enabled
in "trap" mode to crash on OOB array accesses.

Problem
BoundsSan has zero false positives meaning every crash is a OOB array
access, unfortunately optimizations cause these crashes in production
builds to be a bit useless because we only know which function is
crashing but not which line of code.

Godbolt example of the optimization: https://godbolt.org/z/6qjax9z1b

This Diff
I wanted to provide a way to know exactly which LOC is responsible for
the crash. What we do here is use the size of the basic block as an
iterator to an immediate value for the ubsan trap.

Previous discussion: https://reviews.llvm.org/D148654

Correct bad test in 1e004237.  This
affects clang-ppc64le-rhel.

SerializetToHsaco, as currently implemented, leaks the file descriptor
of the .hsaco temporary file, which causes issues in long-running
parallel compilation setups.

See also https://github.com/ROCmSoftwarePlatform/rocMLIR/pull/1257

This reverts commit 9f5960e0 to fix
buildbots reported here https://lab.llvm.org/buildbot/#/builders/230/builds/19412.

On ELF platforms, when there is no global variable and the unique module ID is
non-empty, COMDAT asan.module_ctor is created with no
`__asan_register_elf_globals` calls. If this COMDAT is the prevailing copy
selected by the linker, the linkage unit will have no
`__asan_register_elf_globals` call: the redzone will not be poisoned and ODR
violation checker will not work (#67677).

This behavior is benign for -fno-sanitize-address-globals-dead-stripping because
asan.module_ctor functions that call `__asan_register_globals`
(`InstrumentGlobalsWithMetadataArray`) do not use COMDAT.

To fix #67677:

* Use COMDAT for -fsanitize-address-globals-dead-stripping on ELF platforms.
* Call `__asan_register_elf_globals` even if there is no global variable.
* If the unique module ID is empty, don't call SetComdatForGlobalMetadata:
  placing `@.str` in a COMDAT would incorrectly discard internal COMDAT `@.str`
  in other compile units.

Alternatively, when there is no global variable, asan.module_ctor is not COMDAT
and does not call `__asan_register_elf_globals`. However, the asan.module_ctor
function cannot be eliminated by the linker.

Tested the following script. Only ELF -fsanitize-address-globals-dead-stripping has changed behaviors.
```
echo > a.cc  # no global variable, empty uniqueModuleId
echo 'void f() {}' > b.cc  # with global variable, with uniqueModuleId
echo 'int g;' > c.cc  # with global variable
for t in x86_64-linux-gnu arm64-apple-macosx x86_64-windows-msvc; do
  for gc in -f{,no-}sanitize-address-globals-dead-stripping; do
    for f in a.cc b.cc c.cc; do
      echo /tmp/Rel/bin/clang -S --target=$t -fsanitize=address $gc $f -o -
      /tmp/Rel/bin/clang -S --target=$t -fsanitize=address $gc $f -o - | sed -n '/asan.module_ctor/,/ret/p'
    done
  done
done
```

[Sema] add cast from IncompleteArrayType to ConstantArrayType in TryReferenceListInitialization (#65918)