- Add intrinsics.objc_super()
- Emit objc_msgSendSuper2 calls when an objc method call is combined with objc_super(self)
- Fix objc_block return value ABI for large struct returns
- Fix objc_implement method wrappers bad ABI for large struct returns and indirect args
- Simplify parameter forwarding for objc_imlpement methods
- Add intrinsics.objc_instancetype to mimi Objective-C instancetype* returns
This facilitates returning the correct type on subclasses when calling mehtods
such as `alloc`, `init`, `retain`, etc.
- Refactor Objective-C class implementations generation so that hierarchies are properly initialized
- Better codegen for context passing with ivar-based autocontext
- Allow @superclass on imported objc-c objects
- Better codegen for block forwarding invoker, arguments are forwarded directly
