Ahmed Bougacha 68bf64e302 [X86] Use AVX features instead of ABI to init. SimdDefaultAlign. ...

The ABI string only exists to communicate with TargetCodeGenInfo.
Concretely, since we only used "avx*" ABI strings on x86_64 (as AVX
doesn't affect the i386 ABIs), this meant that, when initializing
SimdDefaultAlign, we would ignore AVX/AVX512 on i386, for no good
reason.

Instead, directly check the features. A similar change for
MaxVectorAlign will follow.

Differential Revision: http://reviews.llvm.org/D12390

llvm-svn: 246228

2015-08-27 22:24:56 +00:00

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