[turbofan] Optimized lowering of DYNAMIC_GLOBAL lookup slot loads.

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 436 matching lines @@
 }
 
 
 void JSGenericLowering::LowerJSLoadDynamicGlobal(Node* node) {
   const DynamicGlobalAccess& access = DynamicGlobalAccessOf(node->op());
   Runtime::FunctionId function_id =
       (access.mode() == CONTEXTUAL) ? Runtime::kLoadLookupSlot
                                     : Runtime::kLoadLookupSlotNoReferenceError;
   Node* projection = graph()->NewNode(common()->Projection(0), node);
   NodeProperties::ReplaceWithValue(node, projection, node, node);
+  node->RemoveInput(NodeProperties::FirstFrameStateIndex(node) + 1);
   node->InsertInput(zone(), 1, jsgraph()->Constant(access.name()));
   ReplaceWithRuntimeCall(node, function_id);
   projection->ReplaceInput(0, node);
 }
 
 
 void JSGenericLowering::LowerJSLoadDynamicContext(Node* node) {
   const DynamicContextAccess& access = DynamicContextAccessOf(node->op());
   Node* projection = graph()->NewNode(common()->Projection(0), node);
   NodeProperties::ReplaceWithValue(node, projection, node, node);
@@ skipping 363 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8