schroedingers `instrument-coverage`

[matthiaskrgr]

It seems that we have both -Zinstrument-coverage=val and -Cinstrument-coverage=val at the same time, since its already stabilized I guess we could remove the corresponding -Zflag?

[Zalathar]

It looks like the stabilization PR (#90132) deliberately left in the -Z flag to ease migration for people who were already using coverage.

Given that it's now been stable for almost 2 years, and the -C flag supports the unstable values (via -Zunstable-options) I can't imagine anyone would object too loudly to its removal now.

[Zalathar]

Note that the same thing was also done when stabilizing -Csymbol-mangling-version=v0 at around the same time, so that flag is probably in the same boat.

[Zalathar]

Also it looks like the stabilization PR also wired up -Zinstrument-coverage to issue a deprecation warning on use.