[InstCombine] don't negate constant expression with fsub (PR37605)
X + (-C) would be transformed back into X - C, so infinite loop: https://bugs.llvm.org/show_bug.cgi?id=37605 llvm-svn: 333610
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X + (-C) would be transformed back into X - C, so infinite loop: https://bugs.llvm.org/show_bug.cgi?id=37605 llvm-svn: 333610