Auto merge of #141366 - matthiaskrgr:rollup-utvtyy3, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #140526 (docs: Specify that common sort functions sort in an ascending direction)
 - #141230 (std: fix doctest and explain for `as_slices` and `as_mut_slices` in `VecDeque`)
 - #141341 (limit impls of `VaArgSafe` to just types that are actually safe)
 - #141347 (incorrectly prefer builtin `dyn` impls :3)
 - #141351 (Move -Zcrate-attr injection to just after crate root parsing)
 - #141356 (lower bodies' params to thir before the body's value)
 - #141357 (`unpretty=thir-tree`: don't require the final expr to be the body's value)
 - #141363 (Document why we allow escaping bound vars in LTA norm)

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

Author: bors