Add a bailout id just before every variable load in fullcode.

src/ast.h

 // Copyright 2012 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.
 
 #ifndef V8_AST_H_
 #define V8_AST_H_
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 1603 matching lines @@
       Isolate* isolate, const ICSlotCache* cache) override;
 
   void SetFirstFeedbackICSlot(FeedbackVectorICSlot slot,
                               ICSlotCache* cache) override;
   Code::Kind FeedbackICSlotKind(int index) override { return Code::LOAD_IC; }
   FeedbackVectorICSlot VariableFeedbackSlot() {
     DCHECK(!UsesVariableFeedbackSlot() || !variable_feedback_slot_.IsInvalid());
     return variable_feedback_slot_;
   }
 
+  static int num_ids() { return parent_num_ids() + 1; }
+  BailoutId BeforeId() const { return BailoutId(local_id(0)); }
+
  protected:
   VariableProxy(Zone* zone, Variable* var, int start_position,
                 int end_position);
 
   VariableProxy(Zone* zone, const AstRawString* name,
                 Variable::Kind variable_kind, int start_position,
                 int end_position);
+  static int parent_num_ids() { return Expression::num_ids(); }
+  int local_id(int n) const { return base_id() + parent_num_ids() + n; }
 
   class IsThisField : public BitField8<bool, 0, 1> {};
   class IsAssignedField : public BitField8<bool, 1, 1> {};
   class IsResolvedField : public BitField8<bool, 2, 1> {};
 
   // Start with 16-bit (or smaller) field, which should get packed together
   // with Expression's trailing 16-bit field.
   uint8_t bit_field_;
   FeedbackVectorICSlot variable_feedback_slot_;
   union {
@@ skipping 1856 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_