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4294df4ceb
When PPCVSXFMAMutate would look at the input addend register, it would get its input value number. This would fail, however, if the register was undef, causing a segfault. Don't segfault (just skip such FMA instructions). Fixes the test case from PR24542 (although that may have been over-reduced). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245741 91177308-0d34-0410-b5e6-96231b3b80d8