Rollup merge of rust-lang#144883 - scottmcm:remove-unneeded-drop_in_place, r=nnethercote

Remove unneeded `drop_in_place` calls

Might as well pull this out from rust-lang#144561 because this is still used in things like `Vec::truncate` where it'd be nice to allow it be removed if inlined enough to see that the type is `Copy`.

So long as perf says it's ok, at least 🤞

Author: Zalathar