[Bug middle-end/67052] tree_single_nonnegative_warnv_p and fold_relational_const are inconsistent with NaNs

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67052

--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot 
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(s/removed/reviewed/)