[Bug rtl-optimization/113234] missing folding to builtin_isunordered if manual nan comparison is used

[jsm28 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113234

--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Note that if flag_signaling_nans, __builtin_isnan should not raise exceptions
for signaling NaN argument (bug 66462), but ==, != and __builtin_isunordered
should raise exceptions for signaling NaN argument.