Split TemplateHashMapImpl::Lookup into two methods

src/compiler/state-values-utils.cc

Index: src/compiler/state-values-utils.cc
diff --git a/src/compiler/state-values-utils.cc b/src/compiler/state-values-utils.cc
index 2c7d0edd7a0951d51a2148e9f9baa6d62d172d00..1c23c8ab88cf2482f00d97084bf1f3913db299e1 100644
--- a/src/compiler/state-values-utils.cc
+++ b/src/compiler/state-values-utils.cc
@@ -105,7 +105,7 @@ 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) {