[X86] Mark XOP vpmac* and vpmadc intrinsics as being commutative so that tablegen will generate patterns with the load in operand 0.

This allows loads to be folded during isel without the peephole pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325548 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed