Introduce cleanups onto arguments to SIL apply instructions, and let CallEmission consume the cleanups corresponding to the values consumed by the called function, so that releases will be emitted as needed to make a foreign call conform to Swift ownership conventions.
Swift SVN r4556
Represent class_method and super_method SIL values using an ObjCMethod variant of LoweredValue that holds the necessary information to emit an objc_msgSend* call when the value is apply-ed. You can't really use ObjC objects from SIL IRGen yet because SILGen doesn't yet visit external definitions from the Clang importer.
Swift SVN r4550
Implement super.constructor for ObjC superclasses by dispatching the superclass init message with objc_msgSendSuper2. Fixes <rdar://problem/13107128>.
Swift SVN r4288
When running in immediate mode, generate a global initializer when an extension is defined for an ObjC class that uses the class_replaceMethod runtime function to dynamically add the extension methods to the ObjC class.
Swift SVN r4153
Emit ObjC stubs and categories for methods defined in extensions of ObjC-compatible classes. This makes extensions of ObjC classes available to ObjC in statically compiled code. For immediate-mode code we'll still need to dynamically register extension methods using the ObjC runtime.
Swift SVN r4149
For Objective-C super calls, build an objc_super struct value containing the receiver and class/metaclass object and pass it to objc_msgSendSuper2. For Swift super calls, emit a direct call to the super implementation.
Swift SVN r4023
