Simplify ReplaceRange.

Currently the second element is a `Vec<(FlatToken, Spacing)>`. But the
vector always has zero or one elements, and the `FlatToken` is always
`FlatToken::AttrTarget` (which contains an `AttributesData`), and the
spacing is always `Alone`. So we can simplify it to
`Option<AttributesData>`.

An assertion in `to_attr_token_stream` can can also be removed, because
`new_tokens.len()` was always 0 or 1, which means than `range.len()`
is always greater than or equal to it, because `range.is_empty()` is
always false (as per the earlier assertion).

compiler/rustc_parse/src/parser/attr.rs

@@ -313,7 +313,7 @@ impl<'a> Parser<'a> {
                 // corresponding macro).
                 let range = start_pos..end_pos;
                 if let Capturing::Yes = self.capture_state.capturing {
-                    self.capture_state.inner_attr_ranges.insert(attr.id, (range, vec![]));
+                    self.capture_state.inner_attr_ranges.insert(attr.id, (range, None));
                 }
                 attrs.push(attr);
             } else {