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Stabilize `ptr::{from_ref, from_mut}`
I propose to stabilize the following APIs:
```rust
// mod core::ptr
pub const fn from_ref<T: ?Sized>(r: &T) -> *const T;
pub const fn from_mut<T: ?Sized>(r: &mut T) -> *mut T;
```
Tracking issue: https://github.com/rust-lang/rust/issues/106116
---
``@RalfJung`` what do you think we should do with `from_mut`? Stabilize it as const, given that you can't call it anyway (no way to get `&mut` in `const fn`)? Defer stabilizing it as const leaving the same issue/feature? Change issue/feature? Change issue/feature to the "`&mut` in const fn" one?
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