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The backend already does this via isNegatibleForFree(), but we may want to alter the fneg IR canonicalizations that currently exist, so we need to try harder to fold fneg in IR to avoid regressions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367227 91177308-0d34-0410-b5e6-96231b3b80d8