swift234

SILGen: Handle ObjC ownership conventions of calls

Port IRGen's calculation of consumed arguments and return value semantics to SILGen, and use it to handle the ownership semantics of calls. Refactor the handling of properties and other clients of emitApply so they can properly hand ownership semantics down to it.

This should let all the moribund cleanup management code in IRGen die. Unfortunately Scope appears to be tied into scoped calculated metadata caching so it's not quite ready to die.

Swift SVN r4834