[PATCH] [GVN} don't propagate equality comparisons of FP zero (PR22376)

[Reid Kleckner]

Don't we have FP math flags for this? See FastMathFlags::noSignedZeros(). Looks like we don't have those on fcmp instrs, though.

We should consider doing this folding if signed zeros are disabled.


http://reviews.llvm.org/D7257

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