[PATCHv3][PR 57371] Remove useless floating point casts in comparisons

[Yuri Gribov]

Hi all,

This is an updated version of patch in
https://gcc.gnu.org/ml/gcc-patches/2017-07/msg00351.html . It adds Inf
and NaN tests suggested by Joseph.

Bootstrapped and regtested on x64. Ok for trunk?

-Y

pr57371-3a.patch
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