More precise result types for contructor calls

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/199413009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19931 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/typing.cc

@@ -562,7 +562,7 @@ void AstTyper::VisitCallNew(CallNew* expr) {
     RECURSE(Visit(arg));
   }
 
-  // We don't know anything about the result type.
+  NarrowType(expr, Bounds(Type::None(zone()), Type::Receiver(zone())));
 }