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`

compiler/rustc_interface/src/tests.rs

@@ -690,7 +690,6 @@ fn test_unstable_options_tracking_hash() {
     untracked!(no_leak_check, true);
     untracked!(no_parallel_llvm, true);
     untracked!(parse_only, true);
-    untracked!(perf_stats, true);
     // `pre_link_arg` is omitted because it just forwards to `pre_link_args`.
     untracked!(pre_link_args, vec![String::from("abc"), String::from("def")]);
     untracked!(print_codegen_stats, true);