Remove redundant hydrogen- and lithium instruction for symbol comparison.

src/hydrogen-instructions.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 73 matching lines @@
   V(Change)                                    \
   V(CheckFunction)                             \
   V(CheckInstanceType)                         \
   V(CheckMap)                                  \
   V(CheckNonSmi)                               \
   V(CheckPrototypeMaps)                        \
   V(CheckSmi)                                  \
   V(ClampToUint8)                              \
   V(ClassOfTest)                               \
   V(Compare)                                   \
-  V(CompareJSObjectEq)                         \
+  V(CompareObjectEq)                           \
   V(CompareMap)                                \
-  V(CompareSymbolEq)                           \
   V(CompareConstantEq)                         \
   V(Constant)                                  \
   V(Context)                                   \
   V(DeleteProperty)                            \
   V(Deoptimize)                                \
   V(Div)                                       \
   V(ElementsKind)                              \
   V(EnterInlined)                              \
   V(ExternalArrayLength)                       \
   V(FixedArrayLength)                          \
@@ skipping 2441 matching lines @@
     HCompare* comp = HCompare::cast(other);
     return token_ == comp->token();
   }
 
  private:
   Representation input_representation_;
   Token::Value token_;
 };
 
 
-class HCompareJSObjectEq: public HBinaryOperation {
+class HCompareObjectEq: public HBinaryOperation {
  public:
-  HCompareJSObjectEq(HValue* left, HValue* right)
+  HCompareObjectEq(HValue* left, HValue* right)
       : HBinaryOperation(left, right) {
     set_representation(Representation::Tagged());
     SetFlag(kUseGVN);
     SetFlag(kDependsOnMaps);
   }
 
   virtual bool EmitAtUses() {
     return !HasSideEffects() && !HasMultipleUses();
   }
 
   virtual Representation RequiredInputRepresentation(int index) const {
     return Representation::Tagged();
   }
   virtual HType CalculateInferredType();
 
-  DECLARE_CONCRETE_INSTRUCTION(CompareJSObjectEq)
+  DECLARE_CONCRETE_INSTRUCTION(CompareObjectEq)
 
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
 };
 
 
-class HCompareSymbolEq: public HBinaryOperation {
- public:
-  HCompareSymbolEq(HValue* left, HValue* right, Token::Value op)
-      : HBinaryOperation(left, right), op_(op) {
-    ASSERT(op == Token::EQ || op == Token::EQ_STRICT);
-    set_representation(Representation::Tagged());
-    SetFlag(kUseGVN);
-    SetFlag(kDependsOnMaps);
-  }
-
-  Token::Value op() const { return op_; }
-
-  virtual bool EmitAtUses() {
-    return !HasSideEffects() && !HasMultipleUses();
-  }
-
-  virtual Representation RequiredInputRepresentation(int index) const {
-    return Representation::Tagged();
-  }
-
-  virtual HType CalculateInferredType() { return HType::Boolean(); }
-
-  DECLARE_CONCRETE_INSTRUCTION(CompareSymbolEq);
-
- protected:
-  virtual bool DataEquals(HValue* other) {
-    return op_ == HCompareSymbolEq::cast(other)->op_;
-  }
-
- private:
-  const Token::Value op_;
-};
-
-
 class HCompareConstantEq: public HUnaryOperation {
  public:
   HCompareConstantEq(HValue* left, int right, Token::Value op)
       : HUnaryOperation(left), op_(op), right_(right) {
     ASSERT(op == Token::EQ_STRICT);
     set_representation(Representation::Tagged());
     SetFlag(kUseGVN);
   }
 
   Token::Value op() const { return op_; }
@@ skipping 1477 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(In)
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_