Auto merge of #34660 - jseyfried:fix_parse_stmt, r=nrc

Auto merge of #34660 - jseyfried:fix_parse_stmt, r=nrc

Fix bugs in macro-expanded statement parsing

Fixes #34543.

This is a [breaking-change]. For example, the following would break:
```rust
macro_rules! m { () => {
    println!("") println!("")
    //^ Semicolons are now required on macro-expanded non-braced macro invocations
    //| in statement positions.
    let x = 0
    //^ Semicolons are now required on macro-expanded `let` statements
    //| that are followed by more statements, so this would break.
    let y = 0 //< (this would still be allowed to reduce breakage in the wild)
}
fn main() { m!() }
```

r? @eddyb