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

[Ahmed Bougacha]

Hi craig.topper,

Since, according to the ISA extension manual, (EVEX versions of) the FMA3/F16C instructions are a core part of AVX512F, it seems to me we should enable the features when avx512f is enabled (e.g., -mavx512f).  If not, users need to either specify a specific CPU, or add the redundant -mfma/-mf16c.

http://reviews.llvm.org/D10617

Files:
  lib/Basic/Targets.cpp
  test/Preprocessor/x86_target_features.c

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