[clang] [compiler-rt] [libcxx] [llvm] [clang] Warn about memset/memcpy to NonTriviallyCopyable types (PR #111434)

[via llvm-commits]

serge-sans-paille wrote:

+ patches to make sure llvm, libc++ and compiler-rt don't trigger that extra warning

https://github.com/llvm/llvm-project/pull/111434