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

Author: bors

src/tests/directives.md

@@ -213,6 +213,8 @@ settings:
   that this directive can be overriden with the `--bypass-ignore-backends=[BACKEND]` command line
   flag. 
 - `needs-backends` — only runs the test if current codegen backend is listed.
+- `needs-offload` — ignores if our LLVM backend was not built with offload support.
+- `needs-enzyme` — ignores if our Enzyme submodule was not built.
 
 The following directives will check LLVM support: