[PATCHv3][PR 81376][PING] Remove unnecessary float casts in comparisons

[Yuri Gribov]

Hi all,

This is a second iteration of patch which gets rid of float casts in
comparisons when all values of casted integral type are exactly
representable by the float type
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81376). The new version
addresses issue spotted by Richard in previous version
https://gcc.gnu.org/ml/gcc-patches/2018-02/msg01119.html

Bootstrapped and regtested on x64_64.

-Y
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