Auto merge of #32012 - bluss:more-drop-in-place, r=alexcrichton

Use `drop_in_place` in Vec and VecDeque

We can use drop_in_place's DST capabilities directly in Vec::drop and similarly in VecDeque::drop. I verfied this has the same effect as the previous `needs_drop` code; `drop_in_place` it itself an intrinsic.

The VecDeque replacement should be more efficient too, even in release mode (slice iteration makes a more efficient loop than the deque iterator).

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