Split TemplateHashMapImpl::Lookup into two methods

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
diff --git a/src/arm/simulator-arm.cc b/src/arm/simulator-arm.cc
index c972b42a7393b1cc391e54a0e910d2104873a43b..ca9a0a894727829d8d70efd008f9a445446fceba 100644
--- a/src/arm/simulator-arm.cc
+++ b/src/arm/simulator-arm.cc
@@ -657,9 +657,8 @@ void Simulator::FlushICache(v8::internal::HashMap* i_cache,
 
 
 CachePage* Simulator::GetCachePage(v8::internal::HashMap* i_cache, void* page) {
-  v8::internal::HashMap::Entry* entry = i_cache->Lookup(page,
-                                                        ICacheHash(page),
-                                                        true);
+  v8::internal::HashMap::Entry* entry =
+      i_cache->LookupOrInsert(page, ICacheHash(page));
   if (entry->value == NULL) {
     CachePage* new_page = new CachePage();
     entry->value = new_page;