Revert "Make FrameStates recursive (to be used for inlining)."

src/compiler/ast-graph-builder.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/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties.h"
@@ skipping 209 matching lines @@
 Node* AstGraphBuilder::Environment::Checkpoint(
     BailoutId ast_id, OutputFrameStateCombine combine) {
   UpdateStateValues(&parameters_node_, 0, parameters_count());
   UpdateStateValues(&locals_node_, parameters_count(), locals_count());
   UpdateStateValues(&stack_node_, parameters_count() + locals_count(),
                     stack_height());
 
   Operator* op = common()->FrameState(ast_id, combine);
 
   return graph()->NewNode(op, parameters_node_, locals_node_, stack_node_,
-                          GetContext(),
-                          builder()->jsgraph()->UndefinedConstant());
+                          GetContext());
 }
 
 
 AstGraphBuilder::AstContext::AstContext(AstGraphBuilder* own,
                                         Expression::Context kind)
     : kind_(kind), owner_(own), outer_(own->ast_context()) {
   owner()->set_ast_context(this);  // Push.
 #ifdef DEBUG
   original_height_ = environment()->stack_height();
 #endif
@@ skipping 1771 matching lines @@
     DCHECK(node->InputAt(frame_state_index)->op()->opcode() == IrOpcode::kDead);
 
     Node* frame_state_node = environment()->Checkpoint(ast_id, combine);
     node->ReplaceInput(frame_state_index, frame_state_node);
   }
 }
 
 }
 }
 }  // namespace v8::internal::compiler