Auto merge of #117773 - nnethercote:rm-Zperf-stats, r=wesleywiser

Remove `-Zperf-stats`.

The included measurements have varied over the years. At one point there were quite a few more, but #49558 deleted a lot that were no longer used. Today there's just four, and it's a motley collection that doesn't seem particularly valuable.

I think it has been well and truly subsumed by self-profiling, which collects way more data.

r? `@wesleywiser`

Author: bors