Auto merge of #156483 - JonathanBrouwer:rollup-P2FxgHh, r=JonathanBrouwer

Rollup of 4 pull requests

Successful merges:

 - rust-lang/rust#154754 (Add Enzyme to build-manifest and rustup)
 - rust-lang/rust#156393 (enable more f16/f128 tests in Miri)
 - rust-lang/rust#154918 (Fix elided lifetime resolution & trait object lifetime defaulting for enum variant paths)
 - rust-lang/rust#156479 (fix missing space in Rc::decrement_strong_count docs)