An invocation of a factory constructor on class A does not necessarily
cause class A to be instantiated--it may redirect to a related or
unrelated class, or instantiate nothing at all.
We handle this by treating constructors similar to static function
calls--when a constructor invocation is found, the constructor element
is added to the queue; later, when the constructor element is
analyzed, we determine whether it instantiates the class or not based
on what kind of constructor it is.
R=brianwilkerson@google.com
Review URL: https://codereview.chromium.org//611153003
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40899 260f80e4-7a28-3924-810f-c04153c831b5
paulberry@google.com
e4e554e65c