Auto merge of #150481 - matthiaskrgr:rollup-f5b2wkm, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang/rust#150108 (Offload: Build offload as a single Step)
 - rust-lang/rust#150262 (slice iter cleanup: replace checked_sub with saturating_sub)
 - rust-lang/rust#150427 (add has_offload/needs-offload to the test infra)
 - rust-lang/rust#150458 (fix running stdlib doctests in Miri in CI)
 - rust-lang/rust#150477 (Fix enum variant suggestion consuming trailing parenthesis)
 - rust-lang/rust#150478 (Fix new bors config)

r? `@ghost`
`@rustbot` modify labels: rollup