Improve code for !identical(a, b):

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 2403 matching lines @@
   Value* left() const { return inputs_[0]; }
   Value* right() const { return inputs_[1]; }
 
   virtual ComparisonInstr* AsComparison() { return this; }
 
   Token::Kind kind() const { return kind_; }
 
   virtual void EmitBranchCode(FlowGraphCompiler* compiler,
                               BranchInstr* branch) = 0;
 
- private:
+ protected:
   Token::Kind kind_;
 };
 
 
 // Inlined functions from class BranchInstr that forward to their comparison.
 inline intptr_t BranchInstr::ArgumentCount() const {
   return comparison()->ArgumentCount();
 }
 
 
@@ skipping 57 matching lines @@
   virtual bool AttributesEqual(Instruction* other) const;
   virtual bool AffectedBySideEffect() const { return false; }
 
   virtual Definition* Canonicalize(FlowGraphOptimizer* optimizer);
 
   virtual void EmitBranchCode(FlowGraphCompiler* compiler,
                               BranchInstr* branch);
 
   bool needs_number_check() const { return needs_number_check_; }
   void set_needs_number_check(bool value) { needs_number_check_ = value; }
+  void set_kind(Token::Kind value) { kind_ = value; }
 
  private:
   // True if the comparison must check for double, Mint or Bigint and
   // use value comparison instead.
   bool needs_number_check_;
 
   DISALLOW_COPY_AND_ASSIGN(StrictCompareInstr);
 };
 
 
@@ skipping 2163 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_