[Patch] Only pass f32/v4f32 in xmm registers in x86-64 if only sse1 is suppored

[Craig Topper]

Not sure if this is actually the right thing to do, but it fixes an issue
on llvm-dev where XMM->FP copy was being created.

This patches makes integer vector types and f64 only pass in xmm if sse2 is
enabled which is when these types are assigned to the xmm class.

-- 
~Craig
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