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

[Erich Keane via cfe-commits]

erichkeane wrote:

> Thanks! I can reproduce. The easy fix is to deactivate the warning for c source but I'd like to udnerstand why it considers that structure as non trivially copyable first :-)

Yeah, agreed completely.  No C structure, afaik, should ever be non-trivially copyable.

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