swift234

Allocating constructors are expected to allocate and assign 'this' on their own.

This implementation is very lame, because we don't currently have a
way to detect (in Sema or SIL) where 'this' gets uniquely assigned,
and turn that assignment into initialization.

Also, I'm starting to hate the name 'allocating' constructor, because
it's the opposite of the Itanium C++'s notion of the allocating
constructor. Will think up a better name.




Swift SVN r3347