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

[Craig Topper]

Are the 512-bit intrinsics in clang's headers qualified with F16C and FMA
defines? They don't seem to be in gcc's headers. And gcc doesn't seem to
auto enable FMA or F16C when avx512 is specified.

Similar question for the instructions in llvm.


http://reviews.llvm.org/D10617

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