[Bug rtl-optimization/122992] speed up loops with TEST_HARD_REG_BIT using EXECUTE_IF_SET_IN_HARD_REG_SET

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122992

--- Comment #31 from Andreas Schwab <sch...@linux-m68k.org> ---
Building cross compilers would have found the most glaring mistakes at least.