[es6] Perform the IsConstructor test in GetSuperConstructor.

src/builtins/builtins-object.cc

 // 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.
 
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/property-descriptor.h"
 
@@ skipping 1056 matching lines @@
   typedef CompareDescriptor Descriptor;
   CodeStubAssembler assembler(state);
 
   Node* constructor = assembler.Parameter(Descriptor::kLeft);
   Node* object = assembler.Parameter(Descriptor::kRight);
   Node* context = assembler.Parameter(Descriptor::kContext);
 
   assembler.Return(assembler.OrdinaryHasInstance(context, constructor, object));
 }
 
+void Builtins::Generate_GetSuperConstructor(
+    compiler::CodeAssemblerState* state) {
+  typedef compiler::Node Node;
+  typedef TypeofDescriptor Descriptor;
+  CodeStubAssembler assembler(state);
+
+  Node* object = assembler.Parameter(Descriptor::kObject);
+  Node* context = assembler.Parameter(Descriptor::kContext);
+
+  assembler.Return(assembler.GetSuperConstructor(object, context));
+}
+
 }  // namespace internal
 }  // namespace v8