[Bug sanitizer/90746] __sanitizer_cov_trace_pc should not be tail called

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90746

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
PR66826 is another bug asking for a similar attribute.
Of course, for a builtin we can check that manually in tree-tailcall.c, but for
user provided functions we need an attribute if we want to support that.