Merge #1394

1394: Fix hover for pat that shadows items r=matklad a=sinkuu

```rust
fn x() {}

fn y() {
    let x = 0i32;
    x; // hover on `x` is expected to be `i32`, but the actual result was `fn x()`
}
```

This was because: if [`res.is_empty()`](https://github.com/sinkuu/rust-analyzer/blob/656a0fa9f99298123d7dcee8c65a8a5ed7043bc4/crates/ra_ide_api/src/hover.rs#L205), it fallbacks to "index based approach" and adds `fn x()` to `res`, which makes [`res.extend(type_of)` below](https://github.com/sinkuu/rust-analyzer/blob/656a0fa9f99298123d7dcee8c65a8a5ed7043bc4/crates/ra_ide_api/src/hover.rs#L260-L266) not happen.

Co-authored-by: Shotaro Yamada <[email protected]>

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