[C2y] Claim conformance and add test coverage for WG14 N3346#115516

AaronBallman merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

AaronBallman:aballman-wg14-n3346AaronBallman/llvm-project:aballman-wg14-n3346Copy head branch name to clipboard