Merge #3482

3482: Fix regression from #3451 r=matklad a=edwin0cheng

There is a regression from #3451 such that the following code has failed to parse in raw item collecting phase:

```rust
macro_rules! with_std { 
 	($($i:item)*) => ($(#[cfg(feature = "std")]$i)*) 
}

with_std! {
	mod macros;
	mod others;
}
```

### Rationale

We always assume the last token of an statement will not end with a whitespace, which is true. It is because in parsing phase,  we always emit `SyntaxNode` before any whitespace. Such that in various parts of RA code, we solely check the semi-colon by using `SyntaxNode::last_child_token() == ";"` . 

However, in #3451, we insert some whitespaces between puncts such that we broke above assumption. This PR fixed this bug by make sure we don't add any whitespace if it is a semicolon.


Co-authored-by: Edwin Cheng <[email protected]>

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