Split TemplateHashMapImpl::Lookup into two methods

src/debug.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 501 matching lines @@
     }
   }
 }
 
 
 void ScriptCache::Add(Handle<Script> script) {
   GlobalHandles* global_handles = isolate_->global_handles();
   // Create an entry in the hash map for the script.
   int id = script->id()->value();
   HashMap::Entry* entry =
-      HashMap::Lookup(reinterpret_cast<void*>(id), Hash(id), true);
+      HashMap::LookupOrInsert(reinterpret_cast<void*>(id), Hash(id));
   if (entry->value != NULL) {
 #ifdef DEBUG
     // The code deserializer may introduce duplicate Script objects.
     // Assert that the Script objects with the same id have the same name.
     Handle<Script> found(reinterpret_cast<Script**>(entry->value));
     DCHECK(script->id() == found->id());
     DCHECK(!script->name()->IsString() ||
            String::cast(script->name())->Equals(String::cast(found->name())));
 #endif
     return;
@@ skipping 42 matching lines @@
     const v8::WeakCallbackData<v8::Value, void>& data) {
   // Retrieve the script identifier.
   Handle<Object> object = Utils::OpenHandle(*data.GetValue());
   int id = Handle<Script>::cast(object)->id()->value();
   void* key = reinterpret_cast<void*>(id);
   uint32_t hash = Hash(id);
 
   // Remove the corresponding entry from the cache.
   ScriptCache* script_cache =
       reinterpret_cast<ScriptCache*>(data.GetParameter());
-  HashMap::Entry* entry = script_cache->Lookup(key, hash, false);
+  HashMap::Entry* entry = script_cache->Lookup(key, hash);
+  DCHECK_NOT_NULL(entry);
   Object** location = reinterpret_cast<Object**>(entry->value);
   script_cache->Remove(key, hash);
 
   // Clear the weak handle.
   GlobalHandles::Destroy(location);
 }
 
 
 void Debug::HandlePhantomDebugInfo(
     const v8::WeakCallbackInfo<DebugInfoListNode>& data) {
@@ skipping 2806 matching lines @@
   logger_->DebugEvent("Put", message.text());
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 } }  // namespace v8::internal