[Bug target/89434] [7/8/9 Regression] wrong code with -Og and __builtin_mul_overflow()

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89434

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45790
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45790&action=edit
gcc9-pr89434.patch

Untested fix.