Some optimizations are apply after UF and VF have been chosen. This
patch adds an extra print of the final VPlan just before
codegen/execution.

In the future, there will be additional transforms that are applied
later (interleaving for example).

PR: https://github.com/llvm/llvm-project/pull/82269

Helps to improve resuls in some cases, while being overall neutral with
respect to compile-time,
https://llvm-compile-time-tracker.com/compare.php?from=2c9b6c1b36b8185299de083c3058e0c1e7760442&to=5984b1649dc12741308089de235647cf036df95f&stat=instructions:u

This reverts commit ffe7049b.

This commit breaks on e.g. arm:
Example:
https://lab.llvm.org/buildbot/#/builders/245/builds/21177/steps/5/logs/FAIL__Clang__stream_c

```
******************** TEST 'Clang :: Analysis/stream.c' FAILED ********************
Exit Code: 1
Command Output (stderr):
--
RUN: at line 1: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/clang -cc1 -internal-isystem /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/lib/clang/19/include -nostdsysteminc -analyze -analyzer-constraints=range -setup-static-analyzer -analyzer-checker=core,alpha.unix.Stream,debug.ExprInspection -verify /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/clang -cc1 -internal-isystem /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/lib/clang/19/include -nostdsysteminc -analyze -analyzer-constraints=range -setup-static-analyzer -analyzer-checker=core,alpha.unix.Stream,debug.ExprInspection -verify /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c
error: 'expected-warning' diagnostics expected but not seen:
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 147: Stream pointer might be NULL
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 153: Stream pointer might be NULL
error: 'expected-warning' diagnostics seen but not expected:
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 148: Stream pointer might be NULL [alpha.unix.Stream]
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 154: Stream pointer might be NULL [alpha.unix.Stream]
4 errors generated.
--
********************
```

This fix is a temporary workaround. `LowerHLFIRIntrinsics.cpp` should be
using the greedy pattern rewriter or a manual IR traversal. All patterns
in this file are rewrite patterns. The test failure was caused by
`replaceAllUsesWith`, which is not supported by the dialect conversion;
additional asserts were added recently to prevent incorrect API usage.
These trigger now.

Alternatively, turning the patterns into conversion patterns and
specifying a type converter may work.

Failing test case:
`Fortran/gfortran/regression/gfortran-regression-compile-regression__inline_matmul_14_f90.test`

llvm-project/clang/lib/CodeGen/CGCall.cpp:3226:24:
error: unused variable 'StructSize' [-Werror,-Wunused-variable]
        llvm::TypeSize StructSize = CGM.getDataLayout().getTypeAllocSize(STy);
                       ^
llvm-project/clang/lib/CodeGen/CGCall.cpp:3227:24:
error: unused variable 'PtrElementSize' [-Werror,-Wunused-variable]
        llvm::TypeSize PtrElementSize =
                       ^
llvm-project/clang/lib/CodeGen/CGCall.cpp:5313:24:
error: unused variable 'SrcTypeSize' [-Werror,-Wunused-variable]
        llvm::TypeSize SrcTypeSize =
                       ^
llvm-project/clang/lib/CodeGen/CGCall.cpp:5315:24:
error: unused variable 'DstTypeSize' [-Werror,-Wunused-variable]
        llvm::TypeSize DstTypeSize = CGM.getDataLayout().getTypeAllocSize(STy);
                       ^
4 errors generated.

Add options --set-symbol-visibility and --set-symbols-visibility to
manually change the visibility of symbols.

There is already an option to set the visibility of newly added symbols
via --add-symbol and --new-symbol-visibility. This option will allow to
change the visibility of already existing symbols.

Only use cld when we also have rep instructions, are calling a function, or contain inline asm.

If only one subvector extraction will be necessary (i.e. because the other is constant etc.) then extract the source operands and perform as a 128-bit comparison

Ideally DAGCombiner's narrowExtractedVectorBinOp would handle this but its tricky to confirm when a target opcode can be safely extracted and performed as a different vector type

Partially improves an outstanding regression in #82290

PR #81833 introduced some changes to broke some debug builds. This
happened due to an indirectly included file referencing an `operator <<`
function which is defined in a `.cpp` file that not linked with `tco`
and `fir-opt`.

When parsing the ASTMatchers.h file, a matcher could specify an argument
that is a matcher using the not needed namespace
`(clang::)ast_matchers::`.
Change the argument parsing in dump_ast_matchers.py to remove those
namespaces such that when parameters with these namespaces slip through,
the namespaces will be not be shown in the matchers reference, like it
is done with the `internal` namespace.
Additionally, remove the not needed namespaces from arguments in
ASTMatchers.h.

Model `getc` and `putc` as equivalent to `fgetc` and `fputc` respectively.

Model `vfscanf` and `vfprintf` as `fscanf` and `fprintf`, except that
`vfscanf` can not invalidate the parameters due to the indirection via a
`va_list`. Nevertheless, we can still track EOF and errors as for `fscanf`.

Added while triaging a regression from #82290

For __arm_new("zt0") we need to have special setup code in the prologue.
For calls that don't preserve zt0, we need to emit code preserve ZT0
around the call.
This is only emitted by SelectionDAG ISel at the moment.

Lowers `G_STORE v4s8, ptr` into

`s32 = G_BITCAST v4s8`
`G_STORE s32, ptr`

Use the main transform interpreter pass instead of the test pass. The
only tests that are not updated are specific to the operation of the
test pass.

This is another smaller step of #70452, changing the signature of
computeAliasing() from optional<uint64_t> to LocationSize, and follow-up
changes in DAGCombiner::mayAlias(). There are some test change due to
the previous AA->isNoAlias call incorrectly using an unknown size
(~UINT64_T(0)). This should then be improved again in #70452 when the
types are known to be scalable.

The dialect conversion maintains sets of "ignored" and "replaced" ops.
This change simplifies the two sets, such that all nested ops are
included. (This was previously not the case and sometimes only the
parent op was included.)

This change allows for more aggressive assertions to prevent incorrect
rewriter API usage. E.g., accessing ops/blocks/regions within an erased
op.

A concrete example: I have seen conversion patterns in downstream
projects where an op is replaced with a new op, and the region of the
old op is afterwards inlined into the newly created op. This is invalid
rewriter API usage: ops that were replaced/erased should not be
accessed. Nested ops will be considered "ignored", even if they are
moved to a different region after the region's parent op was erased
(which is illegal API usage). Instead, create a new op, inline the
regions, then replace the old op with the new op.

Adds basic support for emitting delayed privatizers from flang. So far,
only types of symbols are supported (i.e. scalars), support for more
complicated types will be added later. This also makes sure that
reduction and delayed privatization work properly together by merging
the
body-gen callbacks for both in case both clauses are present on the
parallel construct.

We used to run them, but not check if they failed. If they do,
the expression is invalid, even if we already have a result.

I do have a suspicion that we need to manually call destroyLocals()
in more places (everywhere basically?), but I'll wait with that
until I have a reproducer at hand.

Transform dialect interpreter is designed to be usable outside of the
pass pipeline, as the main program transformation driver, e.g., for
languages with explicit schedules. Provide an example of such usage with
a couple of tests.

for 04e8653f #83199

This prevents us from getting the variable multiple times.

The description in #83146 is slightly inaccurate: it relaxes a tail
undisturbed vslideup to tail agnostic if we are inserting over the
entire tail of the vector **and** we didn't shrink the LMUL of the
vector being inserted into.

This handles the case where we did shrink down the LMUL via InterSubVT
by checking if we inserted over the entire tail of InterSubVT, the
actual type that we're performing the vslideup on, not VecVT.

The current code was doing an unconditional `fir.store %optional_box to
%host_link` which caused a crash when %optional_box is absent because is
is attempting to copy a descriptor from a null address.

Add code to conditionally do the copy at runtime.

The polymorphic array case with lower bounds can be handled with the
array case that already deals with descriptor argument with a few
modifications, just use that.

Also update the RUNs in the extract_subvector tests to be consistent.
Using the term VLS/VLA here as it's more succinct than KNOWNVLEN/UNKNOWNVLEN.

Sync this change to the copy of ItaniumDemangle.h in "llvm":

https://github.com/llvm/llvm-project/pull/82864

The Itanium C++ ABI specifies that FP literals are encoded using a
lowercase hexadecimal string. Previously, libc++abi allowed uppercase
A-F characters but decoded them by subtracting 'a' from them, producing
negative digit values. It is especially confusing to accept an 'E' digit
because 'E' marks the end of the FP literal.

[alpha.webkit.UncountedCallArgsChecker] Allow a variable declaration in a trivial function. (#82291)

I double checked the links by building [the
website](https://github.com/llvm/mlir-www):

```
$ mlir-www-helper.sh --install-docs ../llvm-project website
$ cd website && hugo serve
```

Currently n-d transfer write distribution can be inconsistent with
distribution of reductions if a value has multiple users, one of which
is a transfer_write with a non-standard distribution map, and the other
of which is a vector.reduction.

We may want to consider removing the distribution map functionality in
the future for this reason.

- This PR adds parameterization for shared memory variables that are
used for optimization: `sharedMemoryLineSizeBytes` and
`defaultVectorSizeBits.`
- The default values are set to 128 for both variables since it gives
zero bank conflicts.

Adds basic support for materializing delayed privatization. So far, the
restrictions on the implementation are:
- Only `private` clauses are supported (`firstprivate` support will be
  added in a later PR).

To avoid accidentally setting the label twice for the same instruction,
which can lead to a "lost" label, introduce getOrSetInstLabel()
function. Rename existing functions to getInstLabel()/setInstLabel() to
make it explicit that they operate on instruction labels. Add an
assertion in setInstLabel() that the instruction did not have a prior
label set.

If we know that an insert_subvector inserting a fixed subvector will
overwrite the entire tail of the vector, we use a tail agnostic
vslideup. This was added in https://reviews.llvm.org/D147347, but we can
do the same thing for scalable vectors too.

The `Policy` variable is defined in a slightly weird place but this is
to mirror the fixed length subvector code path as closely as possible. I
think we may be able to deduplicate them in future.