[libcxx-commits] [clang] [libcxx] [clang] Add builtin to clear padding bytes (prework for P0528R3) (PR #75371)

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huixie90 wrote:

We have added similar coverage test on the codegen, but it only uses `FileCheck` to check the IR, which is very weak. There is no mechanism for clang/ tests to run on target unfortunately. Given this builtin is specifically for libc++'s `std::atomic`, I think it is reasonable to make the actual runtime test lives in libcxx folder

https://github.com/llvm/llvm-project/pull/75371