[Bug rtl-optimization/116650] Regrename creates conflict with register pair

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116650

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
It looks like check_new_reg_p doesn't handle the case where the old reg and the
new reg have different number of regs in this mode.