* Bind alias ThisProperty assignment declarations
This is a quick prototype that does the wrong thing at the wrong time
with the wrong technique.
* Preliminary checker handling for aliases
Duplicative and untested, but I think I updated all the places that need
updating.
* new is error; old one should not have been removed
* I don't even know what's happening with this test
* cleanup and testing in the checker
* binder: use lookupSymbolForNameWorker instead of mutable
This should have about the same behaviour and is much easier to
understand.
Also refactor common code a bit.
* Shorter name of lookupSymbolForName
Once upon a time there was a parent/worker function, but now it's just a
single function again. No need for the -Worker suffix.
* remove oodate comment
* fix switch-case-break lint
* Refactor and move functions
* Rename and improve type of getContextualTypeForAssignmentDeclaration
