[PATCH] Improved AVX discovery for X86Subtarget

[Aaron Ballman]

It was pointed out in a comment on PR15351 that X86Subtarget had an
incorrect AVX support test.  This patch addresses that problem.

Another approach that I could take for this patch would be to expose
the OSHasAVXSupport function from Host.cpp (in Support) and reuse the
code in X86Subtarget instead of having a copy of the function.  I was
uncertain whether it was reasonable to expose the function from Host
though since it's processor-specific.

Thanks!

~Aaron
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