[classes] Support AccessorInfo-style data properties in super property stores.

BUG=

Review URL: https://codereview.chromium.org/1711813003

Cr-Commit-Position: refs/heads/master@{#34163}

src/objects.cc

@@ -4283,8 +4283,16 @@ Maybe<bool> Object::SetSuperProperty(LookupIterator* it, Handle<Object> value,
         }
         break;
 
-      case LookupIterator::INTEGER_INDEXED_EXOTIC:
       case LookupIterator::ACCESSOR:
+        if (own_lookup.GetAccessors()->IsAccessorInfo()) {
+          if (own_lookup.IsReadOnly()) {
+            return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
+          }
+          return JSObject::SetPropertyWithAccessor(&own_lookup, value,
+                                                   should_throw);
+        }
+      // Fall through.
+      case LookupIterator::INTEGER_INDEXED_EXOTIC:
         return RedefineIncompatibleProperty(isolate, it->GetName(), value,
                                             should_throw);
 

test/mjsunit/es6/classes-super.js

+// Copyright 2016 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.
+
+"use strict";
+
+class Test {
+  m() {
+    super.length = 10;
+  }
+}
+
+var array = [];
+Test.prototype.m.call(array);
+assertEquals(10, array.length);