Sanjay Patel d2012d965d [InstCombine] fix nsz (fast-math) propagation from fneg-of-select ...

As discussed in the post-commit comments for:
3cdd05e519

It seems to be safe to propagate all flags from the final fneg
except for 'nsz' to the new select:
https://alive2.llvm.org/ce/z/J_APDc

nsz has unique FMF semantics: it is not poison, it is only
"insignificant" in the calculation according to the LangRef.

2021-06-08 17:04:30 -04:00

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