Fixes: #77071
`SubstituteDeducedTypeTransform` will transform type and it will visit
uninstantiated `ExceptionSpecInfo`, which will cause odd behavior.

Since D154036 landed (2a65d038 on July 7, 2023), I've been seeing
many (40-50) libomptarget test failures with errors like the following
on some of our test systems:

```
/auto/software/gcc/x86_64/gcc-11.1.0/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../include/c++/11.1.0/cstdio:99:11: error: no member named 'fpos_t' in the global namespace
   99 |   using ::fpos_t;
      |         ~~^
```

This patch fixes that and doesn't break our other test sytems. I've
looked through the glibc history and at LLVM's libc stdio.h to give me
confidence that this solution should work on other systems. Of course,
there might be use cases I've overlooked, so feedback is appreciated.

Analogous to func.call use FlatSymbolRefAttr to reference the
corresponding mesh.

The change is fairly mechanical:
1. Factor code from `FastISel::selectIntrinsicCall`, which converts
debug intrinsics into debug instructions, into functions (NFC).
2. Call those functions for DPValues attached to instructions too.

The test updates look the same as other RemoveDIs changes: re-run the
tests with `--try-experimental-debuginfo-iterators`, which checks the
output is identical using the new debug info format (if it has been
enabled in the cmake configuration).

Depends on #76941 (otherwise some modified tests spuriously fail).

Choose correct type for updated loop boundaries after scf loop
normalization, do not force chosen type to IndexType

`FusionPredicate` is used to predicate if target instruction matches
 the requirement. The targets can be firstMI, secondMI or both.

The `Fusion` contains a list of `FusionPredicate`. The generated code
will be like:
```
bool isNAME(const TargetInstrInfo &TII,
            const TargetSubtargetInfo &STI,
            const MachineInstr *FirstMI,
            const MachineInstr &SecondMI) {
  auto &MRI = SecondMI.getMF()->getRegInfo();
  /* Predicates */
  return true;
}
```

A boilerplate class called `SimpleFusion` is added. `SimpleFusion` has
a predefined structure of predicates and accepts predicate for
`firstMI`, predicate for `secondMI` and epilog/prolog as arguments.
The generated code for `SimpleFusion` will be like:
```
bool isNAME(const TargetInstrInfo &TII,
            const TargetSubtargetInfo &STI,
            const MachineInstr *FirstMI,
            const MachineInstr &SecondMI) {
  auto &MRI = SecondMI.getMF()->getRegInfo();...

Currently, the AsmWriter can print DPValues, but does not consider them
when creating slots for metadata, which can result in erroneous output
where metadata is numbered incorrectly. This patch modifies the
ModuleSlotTracker to correctly track slots for metadata that appears in
DPValues.

This template is no longer used.

Fixes #74601

Tihs PR adds `clock` and `clock64` special registers to NVVM dialect.

We try to use X32 for gnux32 triples only.

We try to use X32 for gnux32 triples only.

We try to use X32 for gnux32 triples only.

We try to use X32 for gnux32 triples only.

We try to use X32 for gnux32 triples only.

Specification: https://en.cppreference.com/w/c/numeric/math/nan

This patch canonicalizes `switch(C-X)` to `switch(X)`.

Compile-time impact:
http://llvm-compile-time-tracker.com/compare.php?from=7954c57124b495fbdc73674d71f2e366e4afe522&to=31a9adff1e633f0f3c423fb8487fc15d17e171f2&stat=instructions:u

|stage1-O3|stage1-ReleaseThinLTO|stage1-ReleaseLTO-g|stage1-O0-g|stage2-O3|stage2-O0-g|stage2-clang|
|--|--|--|--|--|--|--|
|-0.01%|+0.02%|+0.02%|+0.05%|-0.07%|-0.02%|-0.02%|

This patch calls ProcessCPUUsage() for z/OS because we do not support CLOCK_THREAD_CPUTIME_ID. This copies the change made to google benchmark here
https://github.com/google/benchmark/commit/e3824e7503187993b287ac8c8144a35bf5ccfd44

Types comparison in `StructuralEquivalence` ignores its `DeclContext`
when they are generated by template specialization implicitly and this
will produce incorrect result. Add comparison of `DeclContext` of
ClassTemplateSpecializationDecl to improve result.
fix [issue](https://github.com/llvm/llvm-project/issues/65913

)

Co-authored-by: huqizhi <836744285@qq.com>

Revert 4d7c5ad5 "[NewPM] Update CodeGenPreparePass reference in CodeGenPassBuilder (#77054)"
Revert e0c554ad "Port CodeGenPrepare to new pass manager (and BasicBlockSectionsProfil… (#75380)"

Revert #75380 and #77054 as they were breaking EXPENSIVE_CHECKS buildbots: https://lab.llvm.org/buildbot/#/builders/104

Treat such calls as dependent since it is much easier to implement.

Fixes https://github.com/llvm/llvm-project/issues/71015

This PR improves the documentation for the `gpu-lower-to-nvvm-pipeline`
(as it was remaning item for #75775)

- Changes pipeline `gpu-lower-to-nvvm` -> `gpu-lower-to-nvvm-pipeline`
- Adds a section in GPU Dialect in website. It clarifies the pipeline's
functionality in lowering primary dialects to NVVM targets.

According to
https://mlir.llvm.org/docs/DefiningDialects/Operations/#custom-directives

,
custom directive supports attr-dict

> attr-dict Directive: NamedAttrList &

But it doesn't support prop-dict which is introduced into MLIR recently.
It's useful to have tblgen support prop-dict like attr-dict. This PR
enable tblgen to support prop-dict

```bash
error: only variables and types may be used as parameters to a custom directive
   ... custom<Print>(prop-dict)
```

Co-authored-by: Fung Xie <ftse@nvidia.com>

Removes the HasSVE2p1 variable to stop a warning from https://github.com/llvm/llvm-project/pull/76975

The mappings correspond to vectorized variants (fixed/scalable) for the
math functions: modf, sincos, sincospi.

Forcing the JITLinker to the default configuration shouldn't affect the
configuration of the JIT. Since it's implemented by setting the
ObjectLinkingLayerCreator, it did have side-effects though. In
particular, we skipped the Code- and RelocationModel setting in
`LLJITBuilderState::prepareForConstruction()`.

[NFC][clang][test][asan] Make `instantiation-depth-default.cpp` a valid test case under `asan` and `ubsan` configs (#75254)

Clang test `instantiation-depth-default.cpp` fails on Windows when built
with `ubsan` due to extra warnings printed by the compiler:
```console
File instantiation-depth-default.cpp Line 11: stack nearly exhausted; compilation time may suffer, and crashes due to stack overflow are likely
```
The test case was disabled for `asan` in 571a6478 because of the extra
stack usage. Since `ubsan` also increases stack usage, seems like the
two configs should be treated uniformly.

On the other hand, we might be able to re-enable this test case for
`asan`. During some preliminary testing on Windows, Linux, and macOS
with the host compiler being as old as clang-10, the test case exited
successfully if the `stack-exhausted` warnings are suppressed, though I
haven't done exhaustive testing across platforms and clang versions. Any
insights into whether this change will introduce any risks to existing
buildbots is appreciated.

Enabling this test case for `asan` helps to improve our test coverage,
but if it causes problems on any buildbot, marking it as unsupported for
`ubsan` is also a viable solution.

This patch adds IsStreamingOrSVE2p1 to the applicable builtins and a
warning for when those builtins are not used in a streaming or sve2p1
function.

Lowering of rfft2d to linalg now uses index to i32 cast if an output
float is of 32bit and cast to i64 otherwise.

This PR improves the functionality of the `nvgpu.tma.async.load` Op by
adding support for multicast. While we already had this capability in
the lower-level `nvvm.cp.async.bulk.tensor.shared.cluster.global` NVVM
Op, this PR lowers mask information to the NVVM operation.

The current code for reprocessing the result of fortified libcall
simplifications is not correct, because we might simplify to an
argument of the original call, and if that is again a libcall,
mistakenly think that this is actually the simplification result.

Instead of trying to fix this, simply remove the code entirely,
because InstCombine nowadays correctly handles reprocessing of
SimplifyLibCall results.

Fixes https://github.com/llvm/llvm-project/issues/77064.

Implements: `P1759R6` https://wg21.link/P1759R6

- https://eel.is/c++draft/filebuf
- https://eel.is/c++draft/ifstream
- https://eel.is/c++draft/ofstream
- https://eel.is/c++draft/fstream



---------

Co-authored-by: Zingam <zingam@outlook.com>