[Bug rtl-optimization/80385] [5/6/7 Regression] Segfault in commutative_operand_precedence() rtlanal.c:3373

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80385

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 41173
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41173&action=edit
gcc7-pr80385.patch

Untested fix.