[PATCH] Fix host processor identification for Sandy Bridge

[Aaron Ballman]

This patch addresses PR15351 by explicitly checking for AVX support
when getting the host processor information.  Not all Sandy Bridge
processors support AVX (such as the Pentium-based ones), so I am
checking explicitly for AVX support when deciding which processor to
report.

I'm not entirely certain of how to make a lit test for this though, so
suggestions are welcome.

Thanks!

~Aaron
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