Auto merge of #155655 - JonathanBrouwer:rollup-KFUw3UR, r=JonathanBrouwer

Rollup of 10 pull requests

Successful merges:

 - rust-lang/rust#154794 (Add on_unmatch_args)
 - rust-lang/rust#155133 (Document precision considerations of `Duration`-float methods)
 - rust-lang/rust#154283 (Remove `nodes_in_current_session` field and related assertions)
 - rust-lang/rust#155374 (rustdoc: fix a few spots where emit isn't respected)
 - rust-lang/rust#155587 (Immediately feed visibility on DefId creation)
 - rust-lang/rust#155622 (c-variadic: `va_arg` fixes )
 - rust-lang/rust#155629 (rustc_public: Add `constness` & `asyncness` in `FnDef`)
 - rust-lang/rust#155632 (Some metadata cleanups)
 - rust-lang/rust#155639 (BinOpAssign always returns unit)
 - rust-lang/rust#155647 (rustc-dev-guide subtree update)