[X86] Add comments to the end of FMA3 instructions to make the operation clear

[X86] Add comments to the end of FMA3 instructions to make the operation clear

Summary:
There are 3 different operand orders for FMA instructions so figuring out the exact operation being performed requires a lot of thought.

This patch adds a comment to the end of the assembly line to print the exact operation.

I think I've got all the instructions in here except the ones with builtin rounding.

I didn't update all tests, but I assume we can get them as we regenerate tests in the future.

Reviewers: spatel, v_klochkov, RKSimon

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D44345

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327225 91177308-0d34-0410-b5e6-96231b3b80d8