[PATCH] [CodeGen] Teach X86_64ABIInfo about AVX512.

[John McCall]

Okay, that gives us two options.  The first is to use a macro that's conservative for all types; the second is to add a new type trait.  If the performance difference on PPC64 is important, the type trait seems fine to me.

I guess it would have to be a UnaryExprOrTypeTrait, because the unary type traits don't currently allow returning size_t.


http://reviews.llvm.org/D9894

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