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X86 needs to use its own FMA opcodes, preventing the standard FNEG(FMA) pattern table recognition method used by other platforms. This patch adds support for lowering FNEG(FMA(X,Y,Z)) into a single suitably negated FMA instruction. Fix for PR24364 Differential Revision: http://reviews.llvm.org/D14906 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254016 91177308-0d34-0410-b5e6-96231b3b80d8
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