[Bug web/86867] New bugzilla comment tag to mark comments as obsolete or irrelevant

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86867

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I tagged #c2 as obsolete, and it is hidden, so this already works.  Yay!