dart2js cps: Inline constructor bodies that are only called once.

tests/compiler/dart2js/cps_ir/expected/constructor_9.js

 // Expectation for test: 
 // // Method to test: generative_constructor(C#)
 // class C<T> {
 //   C() { print(T); }
 //   foo() => print(T);
 // }
 // main() {
 //   new C<int>();
 // }
 
 function($T) {
-  var v0 = H.setRuntimeTypeInfo(new V.C(), [$T]);
-  v0.C$0();
-  return v0;
+  var line = H.S(H.createRuntimeType(H.runtimeTypeToString($T)));
+  if (typeof dartPrint == "function")
+    dartPrint(line);
+  else if (typeof console == "object" && typeof console.log != "undefined")
+    console.log(line);
+  else if (!(typeof window == "object")) {
+    if (!(typeof print == "function"))
+      throw "Unable to print message: " + String(line);
+    print(line);
+  }
+  return H.setRuntimeTypeInfo(new V.C(), [$T]);
 }