Implement proposed new identity spec.

runtime/vm/intermediate_language.h

 // Copyright (c) 2012, 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 2205 matching lines @@
 
 
 inline Representation BranchInstr::RequiredInputRepresentation(
     intptr_t i) const {
   return comparison()->RequiredInputRepresentation(i);
 }
 
 
 class StrictCompareInstr : public ComparisonInstr {
  public:
-  StrictCompareInstr(Token::Kind kind, Value* left, Value* right)
-      : ComparisonInstr(kind, left, right) {
-    ASSERT((kind == Token::kEQ_STRICT) || (kind == Token::kNE_STRICT));
-  }
+  StrictCompareInstr(Token::Kind kind, Value* left, Value* right);
 
   DECLARE_INSTRUCTION(StrictCompare)
   virtual RawAbstractType* CompileType() const;
 
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
   virtual bool CanDeoptimize() const { return false; }
 
   virtual bool HasSideEffect() const { return false; }
 
   virtual bool AttributesEqual(Instruction* other) const;
   virtual bool AffectedBySideEffect() const { return false; }
 
   virtual Definition* Canonicalize();
 
   virtual intptr_t ResultCid() const { return kBoolCid; }
 
   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; }
+
  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);
 };
 
 
 class EqualityCompareInstr : public ComparisonInstr {
  public:
   EqualityCompareInstr(intptr_t token_pos,
                        Token::Kind kind,
                        Value* left,
                        Value* right)
@@ skipping 2014 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_