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[Bug libc/13753] [2.15 backport] Really fix AVX tests


http://sourceware.org/bugzilla/show_bug.cgi?id=13753

law at redhat dot com changed:

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                 CC|                            |law at redhat dot com

--- Comment #3 from law at redhat dot com 2012-05-10 19:06:41 UTC ---
I've also got reports that Uli's patch is wrong because it can leave AVX
enabled even though OSXSAVE is off. 

My understanding is:

1. OSXSAVE must be enabled
2. AVX must be enabled
3. XGETBV must have XMM & XMM state enabled

Otherwise AVX can not be used.

This (for example) causes Xen to fail miserably.

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