[Bug plugins/105171] gcc/toplev.c: `local_tick` can overflow and become -1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105171

--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #19)
> It is a small optimization to remove the file is the timestamp is valid
> while compiling.

uh, what coverage.cc is doing is "odd" at best.  local_tick shouldn't have been
exported in the first place.