[X86] Add more FMA3 patterns to cover a load in all 3 possible positions.

[X86] Add more FMA3 patterns to cover a load in all 3 possible positions.

This matches what we already do for AVX512. The peephole pass makes up for this in most if not all cases. But this makes isel behavior for these consistent with every other instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312613 91177308-0d34-0410-b5e6-96231b3b80d8