Auto merge of #90788 - ecstatic-morse:issue-90752, r=wesleywiser

Mark places as initialized when mutably borrowed

Fixes the example in #90752, but does not handle some corner cases involving raw pointers and unsafe. See [this comment](https://github.com/rust-lang/rust/issues/90752#issuecomment-965822895) for more information, or the second test.

Although I talked about both `MaybeUninitializedPlaces` and `MaybeInitializedPlaces` in #90752, this PR only changes the latter. That's because "maybe uninitialized" is the conservative choice, and marking them as definitely initialized (`!maybe_uninitialized`) when a mutable borrow is created could lead to problems if `addr_of_mut` to an uninitialized local is allowed. Additionally, places cannot become uninitialized via a mutable reference, so if a place is definitely initialized, taking a mutable reference to it should not change that.

I think it's correct to ignore interior mutability as nbdd0121 suggests below. Their analysis doesn't work inside of `core::cell`, which *does* have access to `UnsafeCell`'s field, but that won't be an issue unless we explicitly instantiate one with an `enum` within that module.

r? `@wesleywiser`

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