Rollup merge of #78376 - Aaron1011:feature/consistent-empty-expr, r=petrochenkov

Rollup merge of #78376 - Aaron1011:feature/consistent-empty-expr, r=petrochenkov

Treat trailing semicolon as a statement in macro call

See #61733 (comment)

We now preserve the trailing semicolon in a macro invocation, even if
the macro expands to nothing. As a result, the following code no longer
compiles:

```rust
macro_rules! empty {
    () => { }
}

fn foo() -> bool { //~ ERROR mismatched
    { true } //~ ERROR mismatched
    empty!();
}
```

Previously, `{ true }` would be considered the trailing expression, even
though there's a semicolon in `empty!();`

This makes macro expansion more token-based.