RFC: AVX Intrinsics

Where would people like me to put AVX intrinsic definitions?

I could put them in the current IntrinsicsX86.td or put them
in a new file. We've called it IntrinsicsX86AVX.td. We put ours
in a separate file to avoid upstream conflicts but now that we're
getting ready to merge our stuff up we'd like the LLVM community's
opinion on where it should go.

Thanks.

                                -Dave

IntrinsicsX86AVX.td seems reasonable to me.

-Chris