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Clean Code. NFC (#191403)

[libc++][atomics] P3936R1: Safer ``atomic_ref::address`` (#189761)

Implements P3936R1

Closes #189594

# References:

- https://llvm.org/PR162236
- https://wg21.link/p3936r1

---------

Co-authored-by: A. Jiang <de34 at live.cn>
Co-authored-by: Hristo Hristov <zingam at outlook.com>

update

Created using spr 1.3.7

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.7

[skip ci]

update

Created using spr 1.3.7

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.7

[skip ci]

update

Created using spr 1.3.7

[clang][bytecode] Fix implicit-cast-complex-to-vector test (#191662)

[Flang] Mark save-mlir-temps.f90 unsupported (#191686)

This was marked as xfail earlier for some .prefalign fixes, but is
unexpectedly passing on AArch64 Premerge CI.

Just mark it unsupported for now to get things back to green.

[Clang-tidy] Add dummy compile_commands.json for broken test (#191635)

Consequence of https://github.com/llvm/llvm-project/issues/182526.

With PCH used for unit tests (#191402), this breaks now due to matching:

llvm-build/tools/clang/tools/extra/test/clang-tidy/infrastructure/Output/custom-query-check.cpp.tmp/cqc-main.cpp

with:

llvm-build/tools/clang/tools/extra/clangd/unittests/DecisionForestRuntimeTest.cpp

[ELF] Move ++nextGroupId from InputFile ctor to callers. NFC (#191685)

Move this side effect to the call sites in addFile() where the groupId
assignment is more visible.

This makes InputFile construction safe to call from parallel contexts.

update

Created using spr 1.3.7

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.7

[skip ci]

update

Created using spr 1.3.7

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.7

[skip ci]

update

Created using spr 1.3.7

[𝘀𝗽𝗿] initial version

Created using spr 1.3.7

[𝘀𝗽𝗿] changes to main this commit is based on

Created using spr 1.3.7

[skip ci]

fix test

Created using spr 1.3.4

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.4

[skip ci]

fix test

Created using spr 1.3.4

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.4

[skip ci]

WIP

[RISCV] Split LMUL=8 f16 fixed vector (s/u)ittofp/fpto(s/u)i before promoting. (#191568)

The conversion needs to be done by promoting to f32. If we're already at
LMUL=8, we need to split before we can promote.

[libc++][ranges][NFC] Mark LWG3947 as implemented (#191642)

Implemented in
https://github.com/llvm/llvm-project/commit/fc4661aa11a0e974f842e83346ff44609284a4ae

Cleanup switch inconsistencies

Use copy constructor for ScopeChildren

[LLDB] Silence warnings when building on Windows (#191566)

Fixes a few warnings found while building the LLVM installer with
`llvm/utils/release/build_llvm_release.bat --x64 --version 23.0.0
--skip-checkout --local-python`.

[CMake] Enable static libxml2 for Fuchsia toolchain (#191657)

We prefer statically linking all library dependencies.

[clang-doc] Avoid merging into default Info types

When merging into arenas, the code assumed that all using a default
constructed info would be safe, since in the merge we replace any
differing data. However, that appears to be a risky assumption, due
to default initialized members participating in comparisons, and
other operations, leading the program to read garbage data in some
cases. Earlier patches added default initializers to these fields,
but we should prefer (which the old code used to do) to just start
with properly initialized and complete data from the start.

This patch updates the remaining Info types to have copy constructors
that support choosing the arena to allocate into. This is already the
strategy used in several places to avoid use after free bugs. Since
the handling is now uniform, we can simplify things a bit at the same
time and extract the cloning operation into a helper, making the logic
very clear.

This should avoid any potential pitfalls or missed cases that resulted
in the errors discover after landing #190054.