[Bug rtl-optimization/70826] [7 regression] many test cases fail starting with r235442

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70826

--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
I don't know the register-renames code at all -- does it update debug
information when it replaces registers?  Sounds like gdb is getting stale
results for which register represents a memory value.