swift234

SIL: Introduce the 'dynamic_method' instruction for dynamic method dispatch.

The dynamic_method instruction handles method lookup on an existential
of type DynamicLookup based on the selector of an [objc] method of a
class or protocol. It is only introduced in the narrow case where we
are forcing a use of the method with '!', e.g.,

class X {
  func [objc] f() { println("Dynamic lookup") }
}

var x : DynamicLookup = X()
x.f!()



Swift SVN r8037