[clang] constexpr atomic builtins (__c11_atomic_OP and __atomic_OP)#98756

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hanickadot wants to merge 8 commits intollvm:mainfrom

hanickadot:P3309-constexpr-atomic-clang

Commits on Jan 6, 2025

[clang] implement P3309 atomic builtins in constant evaluator
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Commits on Jan 8, 2025

[clang] refactor EvaluateAtomic* builtin support functions. Comments are now full sentences. Add Diagnostics for GCC's atomic misaligned op. Reuse pointer comparison code instead of duplicating.
hanickadot
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[clang] add __atomic_fetch_(add|sub) and __atomic_(add|sub)_fetch tests for diagnostics
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[clang] revert making atomic builtins constexpr, it's not needed, as they are expressions and not functions
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[clang] allow constexpr atomics only in C++ mode, check for valid Memory Ordering arguments of atomic's operations, support `void *` pointer for GCC's atomic_fetch_add/sub and atomic_add/sub_fetch
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Revert "[clang] revert making atomic builtins constexpr, it's not needed, as they are expressions and not functions"
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Commits on Jan 9, 2025