[Bug rtl-optimization/94665] missed minmax optimization opportunity for if/else structure.

[z.zhanghaijian at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94665

--- Comment #8 from z.zhanghaijian at huawei dot com <z.zhanghaijian at huawei 
dot com> ---
(In reply to Segher Boessenkool from comment #7)
> Can r94 or r93 be NaN there?
> 
> (I should build an aarch64 compiler...  takes almost a day though :-) )

Yes, r94 and r93 are function arguments, there is no limit in the example, it
may be NaN. 

-funsafe-math-optimizations allow optimization assume that arguments are not
NaNs like -ffinite-math-only？