ab added a comment.

Unless I'm misunderstanding, I believe this has much less impact than you're 
thinking; there are three cases:

- x86_64: no change (-mno-mmx is guarded by x86)
- x86, with -mno-mmx: no change (because previously, we'd only set avx/avx512 
for x86_64)
- x86, without -mno-mmx: this will use an avx/avx512 ABI string where we'd have 
used "", letting us use the better alignment (only for OpenMP and vectors, I 
think).


http://reviews.llvm.org/D12390



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