Rafael Espindola 57a24199de Revert "Refactoring and enhancement to FMA combine."
This reverts commit r234513. It was failing on the bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234518 91177308-0d34-0410-b5e6-96231b3b80d8
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