[Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage

[cdenizet at mozilla dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87442

--- Comment #6 from calixte <cdenizet at mozilla dot com> ---
from IRC:
<honza> calixte: I think -fprofile-filter-files
<honza> -fprofile-exclude-files
<honza> as Martin proposes looks OK to me.