Handle super-method invocations in CPS->JS backend.

tests/compiler/dart2js/js_backend_cps_ir_supercall_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=-DUSE_CPS_IR=true
+
+// Tests of interceptors.
+
+library supercall_test;
+
+import 'js_backend_cps_ir.dart';
+
+const List<TestEntry> tests = const [
+  const TestEntry.forMethod('function(Sub#m)', """
+class Base {
+  m(x) {
+    print(x+1);
+  }
+}
+class Sub extends Base {
+  m(x) => super.m(x+10);
+}
+main() {
+  new Sub().m(100);
+}""",
+r"""
+function(x) {
+  var v0, v1;
+  v0 = 10;
+  v1 = J.getInterceptor(x).$add(x, v0);
+  return V.Base.prototype.m$1.call(this, v1);
+}"""),
+
+const TestEntry.forMethod('function(Sub#+)', """
+class Base {
+  m(x) {
+    print(x+1000);
+  }
+  operator+(x) => m(x+10);
+}
+class Sub extends Base {
+  m(x) => super.m(x+100);
+  operator+(x) => super + (x+1);
+}
+main() {
+  new Sub() + 10000;
+}""",
+r"""
+function(x) {
+  var v0, v1, v2;
+  v0 = 1;
+  v1 = J.getInterceptor(x).$add(x, v0);
+  v2 = this;
+  return V.Base.prototype.$add.call(null, v2, v1);
+}"""),
+
+const TestEntry.forMethod('function(Sub#m)', """
+class Base {
+  var field;
+}
+class Sub extends Base {
+  m(x) => x + super.field;
+}
+main() {
+  print(new Sub().m(10));
+}""",
+r"""
+function(x) {
+  var v0;
+  v0 = this.field;
+  return J.getInterceptor(x).$add(x, v0);
+}"""),
+
+
+];
+
+void main() {
+  runTests(tests);
+}