[Bug c/64803] [5 Regression] __LINE__ inside macro is not constant

[dodji at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64803

--- Comment #3 from Dodji Seketeli <dodji at gcc dot gnu.org> ---
Created attachment 34614
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34614&action=edit
Candidate fix

This is the patch that I am currently testing.  It seems to fix the issue for
me.  Please let me know if it works for you.