[Bug libgcc/99236] Undefined behaviour in libgcc

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99236

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 50246
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50246&action=edit
gcc11-pr99236.patch

Untested fix.