[Bug rtl-optimization/112415] [14 regression] Python 3.11 miscompiled on HPPA with new RTL fold mem offset pass, since r14-4664-g04c9cf5c786b94

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112415

--- Comment #31 from Jeffrey A. Law <law at gcc dot gnu.org> ---
IIRC r21 is call-clobbered.  So I guess the question turns into what was the
sequence before f-m-o got involved -- was it assuming r21 would be preserved,
or did f-m-o make r21 live across the call?