Rollup merge of #138349 - 1c3t3a:external-weak-cfi, r=rcvalle

Emit function declarations for functions with `#[linkage="extern_weak"]`

Currently, when declaring an extern weak function in Rust, we use the following syntax:
```rust
unsafe extern "C" {
   #[linkage = "extern_weak"]
   static FOO: Option<unsafe extern "C" fn() -> ()>;
}
```
This allows runtime-checking the extern weak symbol through the Option.

When emitting LLVM-IR, the Rust compiler currently emits this static as an i8, and a pointer that is initialized with the value of the global i8 and represents the nullabilty e.g.
```
`@FOO` = extern_weak global i8
`@_rust_extern_with_linkage_FOO` = internal global ptr `@FOO`
```

This approach does not work well with CFI, where we need to attach CFI metadata to a concrete function declaration, which was pointed out in rust-lang/rust#115199.

This change switches to emitting a proper function declaration instead of a global i8. This allows CFI to work for extern_weak functions. Example:
```
`@_rust_extern_with_linkage_FOO` = internal global ptr `@FOO`
...
declare !type !61 !type !62 !type !63 !type !64 extern_weak void `@FOO(double)` unnamed_addr #6
```

We keep initializing the Rust internal symbol with the function declaration, which preserves the correct behavior for runtime checking the Option.

r? `@rcvalle`

cc `@jakos-sec`

try-job: test-various

Author: matthiaskrgr