Split TemplateHashMapImpl::Lookup into two methods

src/compiler/state-values-utils.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/state-values-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 87 matching lines @@
   return static_cast<int>(hash & 0x7fffffff);
 }
 
 }  // namespace
 
 
 Node* StateValuesCache::GetValuesNodeFromCache(Node** nodes, size_t count) {
   StateValuesKey key(count, nodes);
   int hash = StateValuesHashKey(nodes, count);
   ZoneHashMap::Entry* lookup =
-      hash_map_.Lookup(&key, hash, true, ZoneAllocationPolicy(zone()));
+      hash_map_.LookupOrInsert(&key, hash, ZoneAllocationPolicy(zone()));
   DCHECK_NOT_NULL(lookup);
   Node* node;
   if (lookup->value == nullptr) {
     int input_count = static_cast<int>(count);
     node = graph()->NewNode(common()->StateValues(input_count), input_count,
                             nodes);
     NodeKey* new_key = new (zone()->New(sizeof(NodeKey))) NodeKey(node);
     lookup->key = new_key;
     lookup->value = node;
   } else {
@@ skipping 189 matching lines @@
     } else {
       count++;
     }
   }
   return count;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8