Instead of creating multiple CodeBlockItemList nodes, that need to get merged and discarded later on, do this:
* Ensure for libSyntax parsing that we parse the whole file
* Create top-level CodeBlockItem nodes that we just directly wrap with a single CodeBlockItemList node at the end
The importance of this change will become more obvious later on when we'll decouple syntax parsing from the formation of libSyntax tree nodes.
Also fix Edit::intersectsOrTouchesRange check only returning true when the
ranges overlapped, rather than when they overlapped or 'touched'.
Resolves rdar://problem/45108439
