[Bug preprocessor/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 #6 from Dodji Seketeli <dodji at gcc dot gnu.org> ---
Created attachment 34622
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34622&action=edit
Refined candidate fix patch with regression test and cover letter

I have successfully tested this refined patch locally and I am
currently bootstrapping it.  I'll submit it right away if it passes
bootstrap.  Thanks for testing the previous one!