Auto merge of #117905 - RalfJung:no-const-mut, r=lcnr

revert stabilization of const_intrinsic_copy

`@rust-lang/wg-const-eval`  I don't know what we were thinking when we approved rust-lang/rust#97276... const-eval isn't supposed to be able to mutate anything yet! It's also near impossible to actually call `copy` in const on stable since `&mut` expressions are generally unstable. However, there's one exception...

```rust
static mut INT: i32 = unsafe {
    let val = &mut [1]; // `&mut` on arrays is allowed in `static mut`
    (val as *mut [i32; 1]).copy_from(&[42], 1);
    val[0]
};

fn main() { unsafe {
    dbg!(INT);
} }
```

Inside `static mut`, we accept some `&mut` since ~forever, to make `static mut FOO: &mut [T] = &mut [...];` work. We reject any attempt to actually write to that mutable reference though... except for the `copy` functions.

I think we should revert stabilizing these functions that take `*mut`, and then re-stabilize them together with `ptr.write` once mutable references are stable.

(This will likely fail on PowerPC until rust-lang/stdarch#1497 lands. But we'll need a crater run first anyway.)

Author: bors