[turbofan] Avoid unnecessary copying of nodes during inlining.

src/compiler/js-graph.cc

Index: src/compiler/js-graph.cc
diff --git a/src/compiler/js-graph.cc b/src/compiler/js-graph.cc
index 229169f792432fbc52a388ca3e48aed7bc18153e..4efe3a31b03cfd1f2dfece180e74ff027e2ab779 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -222,17 +222,19 @@ Node* JSGraph::ExternalConstant(Runtime::FunctionId function_id) {
 Node* JSGraph::EmptyFrameState() {
   Node* empty_frame_state = cached_nodes_[kEmptyFrameState];
   if (!empty_frame_state || empty_frame_state->IsDead()) {
-    Node* state_values = graph()->NewNode(common()->StateValues(0));
     empty_frame_state = graph()->NewNode(
         common()->FrameState(BailoutId::None(),
                              OutputFrameStateCombine::Ignore(), nullptr),
-        state_values, state_values, state_values, NoContextConstant(),
-        UndefinedConstant(), graph()->start());
+        EmptyStateValues(), EmptyStateValues(), EmptyStateValues(),
+        NoContextConstant(), UndefinedConstant(), graph()->start());
     cached_nodes_[kEmptyFrameState] = empty_frame_state;
   }
   return empty_frame_state;
 }
 
+Node* JSGraph::EmptyStateValues() {
+  return CACHED(kEmptyStateValues, graph()->NewNode(common()->StateValues(0)));
+}
 
 Node* JSGraph::Dead() {
   return CACHED(kDead, graph()->NewNode(common()->Dead()));