[strong] Add tests for loading from super, loading with access checks

test/mjsunit/strong/load-super.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --strong-mode
+
+"use strong";
+
+function testSuper(object) {
+  assertEquals(0, object.validLoad());
+  assertThrows(function(){ return object.propertyLoad() }, TypeError);
+  assertThrows(function(){ return object.elementLoad()  }, TypeError);
+  assertThrows(function(){ return object.accessorLoad() }, TypeError);
+}
+
+class A {
+  constructor() {}
+  foo() {
+    return 0;
+  }
+  get bar() {
+    return 0;
+  }
+  set baz(_) {
+    return;
+  }
+}
+
+class B extends A {
+  constructor() {
+    super();
+  }
+  validLoad() {
+    return super.foo() + super.bar;
+  }
+  propertyLoad() {
+    return super.x;
+  }
+  elementLoad() {
+    return super[1];
+  }
+  accessorLoad() {
+    return super.baz;
+  }
+}
+
+class C extends A {
+  constructor() {
+    super();
+    this[1] = 0;
+    this.x = 0;
+  }
+  get baz() {
+    return 0;
+  }
+  validLoad() {
+    return super.foo() + super.bar;
+  }
+  propertyLoad() {
+    return super.x;
+  }
+  elementLoad() {
+    return super[1];
+  }
+  accessorLoad() {
+    return super.baz;
+  }
+}
+
+let b = new B();
+let c = new C();
+testSuper(b);
+testSuper(c);
+
+let d = {
+  "0": 0,
+  foo: 0,
+  bar: (function(){return 0}),
+  get baz(){return 0},
+  set qux(_){return}
+}
+
+let e = {
+  __proto__: d,
+  "1": 0,
+  x: 0,
+  get baz(){return 0},
+  validLoad() {
+    return super[0] + super.foo + super.bar() + super.baz;
+  },
+  propertyLoad() {
+    return super.x;
+  },
+  elementLoad() {
+    return super[1];
+  },
+  accessorLoad() {
+    return super.qux;
+  }
+}
+
+testSuper(e);