[Bug target/56338] register spill caused by loading constant

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56338

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This one is interesting because the versions which rbp and rbx are saved vs not
happens a few times.