[PATCH] D32401: [Devirtualization] insert placement new barrier with -O0

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

I continue to be really uncomfortable with the entire design of this optimization, which appears to miscompile code by default, but as long as nobody's suggesting that we actually turn it on by default, I guess it can be your little research-compiler playground.  It might be better to downgrade it to a -cc1 option, though.

This specific change is fine by me.


https://reviews.llvm.org/D32401