[Bug c/94641] -Wpadded -fsanitize=undefined together cause warning on main()

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94641

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 48310
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48310&action=edit
gcc10-pr94641.patch

Untested fix.