swift234

SILGen: A first pass at generating destructors.
Generate explicit destructors by emitting their bodies then emitting release sequences for the class's members. Eventually we'll need to also emit implicit destructors for classes without explicit destructors and to chain a call to the base class destructor, which will require adding a new linkable entity flag onto SILConstant for destructors, similar to getter/setters.

Swift SVN r3655