Rollup of 7 pull requests
Successful merges:
- rust-lang/rust#146458 (Add parallel-frontend-threads to bootstrap.toml and enable multi-threaded parallel compilation)
- rust-lang/rust#146485 (Remove unsized arg handling in `ArgAbiBuilderMethods::store_fn_arg` implementations)
- rust-lang/rust#146536 (clean up several trait related UI tests)
- rust-lang/rust#146598 (Make llvm_enzyme a regular cargo feature)
- rust-lang/rust#146647 (Move `#[rustc_coherence_is_core]` to the `crate_level` file)
- rust-lang/rust#146654 (Do not use `git -C dir`)
- rust-lang/rust#146681 (Add space after brace in `Box<[T]>::new_uninit_slice` example)
r? `@ghost`
`@rustbot` modify labels: rollup
93117677d8