Auto merge of #157440 - JonathanBrouwer:rollup-XlcBgjV, r=JonathanBrouwer

Rollup of 8 pull requests

Successful merges:

 - rust-lang/rust#156281 (Emit nofree attribute)
 - rust-lang/rust#157305 (Eagerly decide whether relaxed bounds are allowed or not)
 - rust-lang/rust#148713 (rustc_borrowck: fix async closure error note to report AsyncFn rather than Fn)
 - rust-lang/rust#156266 (Don't ICE in has_self_borrows when coroutine captures-by-ref ty is still inferred)
 - rust-lang/rust#156417 (Fix an ICE in the vtable iteration for a trait reference in const eval when a supertrait is not implemented)
 - rust-lang/rust#156956 (Support generic params in `Lift_Generic`)
 - rust-lang/rust#157140 ( rustc_target: Use rustc_abi instead of cfg_abi to detect powerpcspe )
 - rust-lang/rust#157423 (Refactor/expand rustc_attr_parsing docs)

Author: bors