Rollup of 9 pull requests
Successful merges:
- #123043 (Disable dead variant removal for `#[repr(C)]` enums.)
- #126405 (Migrate some rustc_builtin_macros to SessionDiagnostic)
- #127037 (Remove some duplicated tests)
- #127283 (Reject SmartPointer constructions not serving the purpose)
- #127301 (Tweak some structured suggestions to be more verbose and accurate)
- #127307 (Allow to have different types for arguments of `Rustc::remap_path_prefix`)
- #127309 (jsondocck: add `$FILE` built-in variable)
- #127314 (Trivial update on tidy bless note)
- #127319 (Remove a use of `StructuredDiag`, which is incompatible with automatic error tainting and error translations)
r? `@ghost`
`@rustbot` modify labels: rollup
8a9cccb100