[Bug sanitizer/81125] [7/8 Regression] -fsanitize=undefined ICE

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81125

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Fixed.

Still failing on darwin (r249501): see comment 4. Should I reopen this PR or
file a new one?