Switch CallConstructStub to take new.target in register.

src/compiler/js-generic-lowering.cc

 // Copyright 2014 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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 531 matching lines @@
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
   CallDescriptor* desc =
       Linkage::GetStubCallDescriptor(isolate(), zone(), d, arity - 1, flags);
   Node* stub_code = jsgraph()->HeapConstant(stub.GetCode());
   Node* actual_construct = NodeProperties::GetValueInput(node, 0);
   Node* original_construct = NodeProperties::GetValueInput(node, arity - 1);
   node->RemoveInput(arity - 1);  // Drop original constructor.
   node->InsertInput(zone(), 0, stub_code);
   node->InsertInput(zone(), 1, jsgraph()->Int32Constant(arity - 2));
   node->InsertInput(zone(), 2, actual_construct);
-  // TODO(mstarzinger): Pass original constructor in register.
-  CHECK_EQ(actual_construct, original_construct);
-  node->InsertInput(zone(), 3, jsgraph()->UndefinedConstant());
+  node->InsertInput(zone(), 3, original_construct);
+  node->InsertInput(zone(), 4, jsgraph()->UndefinedConstant());
   node->set_op(common()->Call(desc));
 }
 
 
 void JSGenericLowering::LowerJSCallFunction(Node* node) {
   const CallFunctionParameters& p = CallFunctionParametersOf(node->op());
   int arg_count = static_cast<int>(p.arity() - 2);
   CallFunctionStub stub(isolate(), arg_count, p.flags());
   CallInterfaceDescriptor d = stub.GetCallInterfaceDescriptor();
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
@@ skipping 277 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8