Fix name resolution in `typealias` with constraint

[KushalP]

The body of a typealias gets inlined into wherever the typealias is used. This fixes a bug where the name resolution would resolve an additional type constraint on the next scope of this.

Lack of a frame scope

typealias doesn't currently have a frame scope, which is why we have to assign the owner and the receiver here. If it did, we could read both of these at the point where we're trying to resolve the typealias in question.