swift234

fix ConstructorDecl::getDelegatingOrChainedInitKind to notice that an init
method has the convenience attribute on it when inferring the type of an
init that contains no self.init or super.init method.  This allows us to
properly infer that these things are delegating initializers, which trickles
down to emitting:

a.swift:7:3: error: self.init isn't called on all paths in delegating initializer

for:

  required convenience init(foo: Int) {
  }

instead of doing DI as though the initializer was a root init.



Swift SVN r21120