[turbofan] Remove eager frame state from property access.

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/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
@@ skipping 400 matching lines @@
 
 
 // Helper for generating before and after frame states.
 class AstGraphBuilder::FrameStateBeforeAndAfter {
  public:
   FrameStateBeforeAndAfter(AstGraphBuilder* builder, BailoutId id_before)
       : builder_(builder), frame_state_before_(nullptr) {
     frame_state_before_ = id_before == BailoutId::None()
                               ? builder_->GetEmptyFrameState()
                               : builder_->environment()->Checkpoint(id_before);
-    // Create an explicit checkpoint node for before the operation.
-    Node* node = builder_->NewNode(builder_->common()->Checkpoint());
-    DCHECK_EQ(IrOpcode::kDead,
-              NodeProperties::GetFrameStateInput(node, 0)->opcode());
-    NodeProperties::ReplaceFrameStateInput(node, 0, frame_state_before_);
+    if (id_before != BailoutId::None()) {
+      // Create an explicit checkpoint node for before the operation.
+      Node* node = builder_->NewNode(builder_->common()->Checkpoint());
+      DCHECK_EQ(IrOpcode::kDead,
+                NodeProperties::GetFrameStateInput(node, 0)->opcode());
+      NodeProperties::ReplaceFrameStateInput(node, 0, frame_state_before_);
+    }
   }
 
   void AddToNode(
       Node* node, BailoutId id_after,
       OutputFrameStateCombine combine = OutputFrameStateCombine::Ignore()) {
     int count = OperatorProperties::GetFrameStateInputCount(node->op());
     DCHECK_LE(count, 2);
 
     if (count >= 1) {
       // Add the frame state for after the operation.
@@ skipping 3937 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8