swift234

[devirtualization] Teach the devirtualizer how to handle specialized protocol conformances.

Now we can devirtualize conformances like the following:

protocol P {
  func doSomething()
}

struct X { }

struct B<T> : P {
  func doSomething() { ... }
}

func whatShouldIDo(p : P) {
  p.doSomething()
}

var b = B<X>()
whatShouldIDo(b)

rdar://16638833

Swift SVN r16874