Auto merge of #17865 - ShoyuVanilla:exhaust-block, r=Veykril

fix: Missing non-exhaustive let diagnostics inside async or unsafe block

The reason that this test doesn't have a pointer deref case is because the following code;
```rust
fn test(ptr: *const Result<i32, !>) {
    unsafe {
        let Ok(_x) = *ptr;
    }
}
```
is getting a block with no stmts but tail one in here(thus, no diagnostic error),
https://github.com/rust-lang/rust-analyzer/blob/0daeb5c0b05cfdf2101b0f078c27539099bf38e6/crates/hir-ty/src/diagnostics/expr.rs#L256-L257
while the following is getting a block with a single stmt without tail 🤔
```rust
fn test(x: Result<i32, &'static !>) {
    let Ok(_y) = x;
}
```
I'll make a more deep inspection and file this as a new issue

_Originally posted by `@ShoyuVanilla` in https://github.com/rust-lang/rust-analyzer/pull/17853#discussion_r1712993585_

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