[GlobalISel] Add default action for G_FNEG
Summary: rL297171 introduced G_FNEG for floating-point negation instruction and IRTranslator started to translate `FSUB -0.0, X` to `FNEG X`. This patch adds a default action for G_FNEG to avoid breaking existing targets.
Reviewers: qcolombet, ab, kristof.beyls, t.p.northover, aditya_nandakumar, dsanders
Reviewed By: qcolombet
Subscribers: dberris, rovka, llvm-commits
Differential Revision: https://reviews.llvm.org/D30721
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297301
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projects / llvm / commit