[Bug rtl-optimization/70886] -frename-registers causes boostrap comparison failures on ia64

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70886

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's an issue in the speculative machinery of the scheduler but fortunately
easy to fix once you pinpointed it...