[D-runtime] Need support in core.cpuid for AVX detection

[Martin Nowak]

On Sun, 15 Jan 2012 23:04:09 +0100, Walter Bright <walter at digitalmars.com>  
wrote:

> http://en.wikipedia.org/wiki/Advanced_Vector_Extensions#CPUs_with_AVX
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I did wrote that too sometime ago.
DMD is missing the xgetbv instruction to do so.