[Bug rtl-optimization/123586] subreg_lowpart_p wrongly allows paradoxical subregs

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123586

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
subreg_lowpart_p has accepted paradoxical subregs since 1992. 

So let's rename it to subreg_lowpart_or_paradoxical_p .