[X86] Only 213 FMA3 variants should be marked commutable.

Commuting the 231 and 132 variants would swap addends and
multiplicands/multipliers, which isn't valid.

I'm still trying to reduce a decent test case for this.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200792 91177308-0d34-0410-b5e6-96231b3b80d8