[Bug target/81647] inconsistent LTGT behavior at different optimization levels on AArch64.

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81647

--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Indeed, it's purely the *internal* LTGT_EXPR and LTGT RTL for which the 
semantics are unclear; the semantics of the built-in function are 
unambiguous (exception only for signaling NaNs).