Rollup merge of #61114 - RalfJung:vec, r=Gankro

Vec: avoid creating slices to the elements

Instead of `self.deref_mut().as_mut_ptr()` to get a raw pointer to the buffer, use `self.buf.ptr_mut()`. This (a) avoids creating a unique reference to all existing elements without any need, and (b) creates a pointer that can actually be used for the *entire* buffer, and not just for the part of it covered by `self.deref_mut()`.

I also got worried about `RawVec::ptr` returning a `*mut T` from an `&self`, so I added both a mutable and an immutable version.

Cc @Gankro in particular for the `assume` changes -- I don't know why that is not in `Unique`, but I moved it up from `Vec::deref` to `RawVec::ptr` to avoid having to repeat it everywhere.

Fixes https://github.com/rust-lang/rust/issues/60847

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