[Bug target/80125] [7 Regression] r246297 causes segfault in reg_used_between_p()

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80125

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Created attachment 41010
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41010&action=edit
another patch

I used this one instead.  all_adjacent is a pretty useless optimisation here,
reg_used_between_p will return almost immediately if the two insns are
consecutive.