[Flang][Driver] Add -print-resource-dir command line flag to emit Flang's resource directory (#90886)

This should be a NFC change for all drivers, but Flang.

It can be used in tests #91918, #91931 and such.

When Zicfilp enabled, indirect jump table branch should be a software
guarded branch.

This matches what we do for extensions, and saves us having to do it in
RISCVISAInfo.

This is a minor tweak to what I added in #91993.

Allow to skip running the TOSA validation pass when spec conformance is
not required.

After #86509 allowed all integer types in TOSA ops, this PR allows TOSA
ops on all floating point types.
This helps to experiment with `f64` and 8-bit float types when spec
conformance is not required.

I was benchmarking the MatchTable when I found that
`getConstantVRegValWithLookThrough` took a non-negligible amount of
time, about 7.5% of all of
`AArch64PreLegalizerCombinerImpl::tryCombineAll`.

I decided to take a closer look to see if I could squeeze some
performance out of it, and I landed on a few changes that:
- Avoid copying APint unnecessarily, especially returning
std::optional<APInt> can be expensive when a out parameter also works.
- Avoid indirect call by using templated function pointers instead of
function_ref/std::function

Both of those changes seem to speedup this function by about 50%, but my
benchmarking (`perf record`) seems inconsistent (so take measurements
with a grain of salt), I saw as high as 4.5% and as low as 2% for this
function on the exact same input after the changes, but it never got
close again to 7% in a few runs so this looks like a stable improvement.

Recurring meeting at 3rd Thursday of every month.

Since https://github.com/llvm/llvm-project/pull/91150, a proxy header
for the errno macros is available and gets included in `libc_errno.h`
since then.

As `libc_errno.cpp` includes `libc_errno.h`, which already includes the
proxy header `hdr/errno_macros.h`, there's no need to include it in
`libc_errno.cpp` if we are in overlay mode, because the proxy header
takes care to either include our header from libc/include/ (fullbuild)
or the corresponding underlying system header (overlay).

Remove FormatToken::isSimpleTypeSpecifier() and call
Token::isSimpleTypeSpecifier(LangOpts) instead.

The same registers are listed in the same order in FixedCSRFIMap.

This is just the TableGen-side changes, split out as the minimal
testable unit. It doesn't yet transition RVA23 and friends to be
experimental (and add the necessary other changes for this to work).

Although choosing not to emit the SupportedExperimentalProfiles array if
no experimental profiles are present isn't consistent with what we do
for experimental extensions, we need to do this in order to avoid adding
a warning for the empty array when building LLVM for as long as we don't
have any experimental profiles defined.

wg21.link/P2552 suggest that __has_cpp_attribute
should return a non-zero value for all attributes that the
implementation does something interesting with.

Clang does something meaninful with all attributes except for:

- no_unique_address which we do not support for msvc target
- carries_dependency which arguably does nothing interesting. P2552
shies away from specifying a behavior for that attribute (despite being
the only one for which a recommandation would have been interesting,
arguably)

As such, we have nothing to change for this paper. This paper is a DR
and clang always behaved reasonably.

[alpha.webkit.UncountedCallArgsChecker] Allow explicit instantiation of Ref/RefPtr on call arguments. (#91875)

Co-authored-by: Ryosuke Niwa <rniwa@apple.com>

Remove the switch statement and instead do range checks to know which
pieces we need to print.

Move static member functions LeftRightQualifierAlignmentFixer::is...()
out of the class so that #91712 can reland.

As discussed in
https://github.com/llvm/llvm-project/commit/3cf8535dbf0bf5fafa99ea1f300e2384a7254fba
We are not allowed to combine explicit fptrunc/fpext from user.

When someone wants to declare a test case without any diagnosis.
check-clang-tidy will failed with error message

```
CHECK-FIXES, CHECK-MESSAGES or CHECK-NOTES not found in the input
```

This PR want to check there are no diagnosis from clang-tidy when
CHECK-FIXES, CHECK-MESSAGES or CHECK-NOTES are not found.

It also changes the extension of a test case. `hxx` is not a valid test
case extension and won't be tested.

---------

Co-authored-by: Danny Mösch <danny.moesch@icloud.com>

This test was modified as part of the commit:

9a7262c2

but without that patch this test is failing.  Remove the test for now
till the issue with the original patch can be sorted out.

StringMapImpl allocates the memory for the table, but does not have a
dtor that free it. Instead, StringMap (which inherits from
StringMapImpl) contains the free call. I don't really see a good reason
why this free is performed in the "wrong" class, so move it into
StringMapImpl.

This is currently bailing out on MemSizeInBytes larger than 64 bytes.
However, the following code can only handle sizes up to 8 bytes.
Possibly there was confusion here between MemSizeInBytes and
MemSizeInBits.

I *think* that this can't actually result in an out of bounds read of
the opcode table because we'll only ever mark loads/stores of up to 8
bytes as legal (16 byte atomics are custom-legalized earlier). As such,
I've changed this condition to an assert.

This reverts commit a7eff59f.

Revert "[lldb][DWARF] Delay struct/class/union definition DIE searching when parsing declaration DIEs. (#90663)"

This reverts commit 9a7262c2.

We only ever use the last element of this array, so there shouldn't be a
need to store the preceding elements as well.

This reverts commit 91446e2a and
a unittest followup 1530f319 (#90476).

In a stage-2 -flto=thin -gsplit-dwarf -g -fdebug-info-for-profiling
-fprofile-sample-use= build of clang, a ThinLTO backend compile has
assertion failures:

    Global is external, but doesn't have external or weak linkage!
    ptr @_ZN5clang12ast_matchers8internal18makeAllOfCompositeINS_8QualTypeEEENS1_15BindableMatcherIT_EEN4llvm8ArrayRefIPKNS1_7MatcherIS5_EEEE
    function declaration may only have a unique !dbg attachment
    ptr @_ZN5clang12ast_matchers8internal18makeAllOfCompositeINS_8QualTypeEEENS1_15BindableMatcherIT_EEN4llvm8ArrayRefIPKNS1_7MatcherIS5_EEEE

The failures somehow go away if -fprofile-sample-use= is removed.

We have been collecting release notes from the PRs for most of the
18.1.x releases and this just helps automate the process.

Patch #91150 added a proxy header for errno macros. This patch fixes the
bazel build since it needs to be added as a dependency.

We can't save vector registers without V/Zve.