[Bug testsuite/116143] [15 regression] gcc.dg/plugin/diagnostic-* test fails intermittently

[seurer at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116143

--- Comment #7 from seurer at gcc dot gnu.org ---
I was wrong initially about this being intermittent.  It always fails for a
compiler built with --enable-checking=release and it started with
r15-1410-gf89f9c7ae7190c