Roman Lebedev f8079355c6 [InstCombine] canonicalizeAbsNabs(): don't propagate NSW flag for NABS patter ...

As Nuno is noting in post-commit review in
https://reviews.llvm.org/D87188#2467915
it is not correct to keep NSW for negated abs pattern,
so don't do that.

2020-12-24 00:06:09 +03:00

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