[turbofan] Remove the EmptyFrameState caching on JSGraph.

src/compiler/js-graph.cc

 // Copyright 2014 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/code-stubs.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/typer.h"
 
 namespace v8 {
@@ skipping 200 matching lines @@
     *loc = graph()->NewNode(common()->ExternalConstant(reference));
   }
   return *loc;
 }
 
 
 Node* JSGraph::ExternalConstant(Runtime::FunctionId function_id) {
   return ExternalConstant(ExternalReference(function_id, isolate()));
 }
 
-
-Node* JSGraph::EmptyFrameState() {
-  Node* empty_frame_state = cached_nodes_[kEmptyFrameState];
-  if (!empty_frame_state || empty_frame_state->IsDead()) {
-    empty_frame_state = graph()->NewNode(
-        common()->FrameState(BailoutId::None(),
-                             OutputFrameStateCombine::Ignore(), nullptr),
-        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()));
 }
 
 
 void JSGraph::GetCachedNodes(NodeVector* nodes) {
   cache_.GetCachedNodes(nodes);
   for (size_t i = 0; i < arraysize(cached_nodes_); i++) {
     if (Node* node = cached_nodes_[i]) {
       if (!node->IsDead()) nodes->push_back(node);
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8