[Turbofan] run load elimination concurrently.

src/compiler/branch-elimination.cc

 // 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.
 
 #include "src/compiler/branch-elimination.h"
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 BranchElimination::BranchElimination(Editor* editor, JSGraph* js_graph,
                                      Zone* zone)
     : AdvancedReducer(editor),
       jsgraph_(js_graph),
       node_conditions_(zone, js_graph->graph()->NodeCount()),
       zone_(zone),
-      dead_(js_graph->graph()->NewNode(js_graph->common()->Dead())) {}
+      dead_(js_graph->graph()->NewNode(js_graph->common()->Dead())) {
+  NodeProperties::SetType(dead_, Type::None());
+}
 
 BranchElimination::~BranchElimination() {}
 
 
 Reduction BranchElimination::Reduce(Node* node) {
   switch (node->opcode()) {
     case IrOpcode::kDead:
       return NoChange();
     case IrOpcode::kDeoptimizeIf:
     case IrOpcode::kDeoptimizeUnless:
@@ skipping 272 matching lines @@
 
 Graph* BranchElimination::graph() const { return jsgraph()->graph(); }
 
 CommonOperatorBuilder* BranchElimination::common() const {
   return jsgraph()->common();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8