Rollup merge of #129684 - Strophox:miri-pass-pointer-to-ffi, r=RalfJung

Enable Miri to pass pointers through FFI

Following https://github.com/rust-lang/rust/pull/126787, the purpose of this PR is to now enable Miri to execute native calls that make use of pointers.

> <details>
>
> <summary> Simple example </summary>
>
> ```rust
> extern "C" {
>     fn ptr_printer(ptr: *mut i32);
> }
>
> fn main() {
>     let ptr = &mut 42 as *mut i32;
>     unsafe {
>         ptr_printer(ptr);
>     }
> }
> ```
> ```c
> void ptr_printer(int *ptr) {
>   printf("printing pointer dereference from C: %d\n", *ptr);
> }
> ```
> should now show `printing pointer dereference from C: 42`.
>
> </details>

Note that this PR does not yet implement any logic involved in updating Miri's "analysis" state (byte initialization, provenance) upon such a native call.

r? ``@RalfJung``

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