swift234

SIL: Remove 'UncurryDirection' and uncurry all methods right-to-left.

ObjC methods are already tagged with a special calling convention and have special IRGen handling to keep the _cmd argument abstracted away from SIL. We can use the CC to also abstract away the detail that Swift methods pass 'self' last but ObjC methods pass 'self' first. This eliminates a weird special case from SIL's perspective, and also means that 'partial_apply' can work on objc methods correctly without becoming significantly more complex.

Swift SVN r8091