[PATCH] Enable fma and f16c features when avx512f is enabled.

[Ahmed Bougacha]

Yep, simple enough:  r240616, let me know if I missed anything.

The 213->231 xform, I'll leave for another day, since we can't
currently disassemble the 231/132 variants: PR23937.
Also, F16C is a wee bit trickier, and not just about flags: PR23941.

-Ahmed


http://reviews.llvm.org/D10617

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