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



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