[Bug target/96787] rs6000 mcpu=power10 miscompiles libiberty htab_delete() causing bootstrap failure

[acsawdey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96787

--- Comment #2 from acsawdey at gcc dot gnu.org ---
I'm seeing some load-past-store code motion that happens when compiling for
power10 vs power9 that makes me suspicious.