Rollup merge of #91185 - camelid:rm-force-overflow-checks, r=wesleywiser

Remove `-Z force-overflow-checks`

It was replaced several years ago by the stable option `-C overflow-checks`.
The goal was to delete the `-Z` flag once users had migrated [1].
Now that it's been several years, it makes sense to delete the old flag.

See also the discussion on Zulip [2].

[1]: https://github.com/rust-lang/rust/issues/33134#issuecomment-280484097
[2]: 262497224

r? ```@wesleywiser```
cc ```@RalfJung```

compiler/rustc_interface/src/tests.rs

@@ -726,7 +726,6 @@ fn test_debugging_options_tracking_hash() {
     tracked!(dep_info_omit_d_target, true);
     tracked!(dual_proc_macros, true);
     tracked!(fewer_names, Some(true));
-    tracked!(force_overflow_checks, Some(true));
     tracked!(force_unstable_if_unmarked, true);
     tracked!(fuel, Some(("abc".to_string(), 99)));
     tracked!(function_sections, Some(false));