Auto merge of #65933 - crgl:vec-deque-truncate, r=alexcrichton

Use ptr::drop_in_place for VecDeque::truncate and VecDeque::clear

This commit allows `VecDeque::truncate` to take advantage of its (largely) contiguous memory layout and is consistent with the change in #64432 for `Vec`. As with the change to `Vec::truncate`, this changes both:

- the drop order, from back-to-front to front-to-back
- the behavior when dropping an element panics

For consistency, it also changes the behavior when dropping an element panics for `VecDeque::clear`.

These changes in behavior can be observed. This example ([playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=d0b1f2edc123437a2f704cbe8d93d828))
```rust
use std::collections::VecDeque;

fn main() {
    struct Bomb(usize);
    impl Drop for Bomb {
        fn drop(&mut self) {
            panic!(format!("{}", self.0));
        }
    }
    let mut v = VecDeque::from(vec![Bomb(0), Bomb(1)]);
    std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
        v.truncate(0);
    }));
    std::mem::forget(v);
}
```
panics printing `1` today and succeeds. `v.clear()` panics printing `0` today and succeeds. With the change, `v.clear()`, `v.truncate(0)`, and dropping the `VecDeque` all panic printing `0` first and then abort with a double-panic printing `1`.

The motivation for this was making `VecDeque::truncate` more efficient since it was used in the implementation of `VecDeque::clone_from` (#65069), but it also makes behavior more consistent within the `VecDeque` and with `Vec` if that change is accepted (this probably doesn't make sense to merge if not).

This might need a crater run and an FCP as well.