Fixes for super tearoff in constructor

tests/language_strong/super_from_constructor_test.dart

Index: tests/language_strong/super_from_constructor_test.dart
diff --git a/tests/language_strong/super_from_constructor_test.dart b/tests/language_strong/super_from_constructor_test.dart
index f19bf116fc042cbe7a54c6d232a2dcbe6effdd52..352066a76f9fcbca8b01d72b4091e24a81111e67 100644
--- a/tests/language_strong/super_from_constructor_test.dart
+++ b/tests/language_strong/super_from_constructor_test.dart
@@ -6,9 +6,17 @@ import "package:expect/expect.dart";
 
 final results = [];
 
+int invoke(int f()) => f();
+
 class Base {
   var f;
+  var z;
+
   m(x) => results.add(x);
+
+  int g() {
+    return 42;
+  }
 }
 
 class C extends Base {
@@ -17,6 +25,11 @@ class C extends Base {
   C(this._iter) {
     _iter.map((x) => super.m(x)).toList();
     super.f = _iter;
+    z = invoke(super.g);
+  }
+
+  int g() {
+    return -1;
   }
 }
 
@@ -24,4 +37,5 @@ main() {
   var c = new C([1, 2, 3]);
   Expect.listEquals(results, [1, 2, 3]);
   Expect.listEquals(c.f, [1, 2, 3]);
+  Expect.equals(42, c.z);
 }