[Bug preprocessor/69543] [6/7 Regression] _Pragma does not apply within macro

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69543

--- Comment #10 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
The lines in comment #9 came from 18f0e0e551a995687e1822aabb9b7d7ee8f11492
aka r186971 (affecting gcc.dg/cpp/pragma-diagnostic-2.c)