Remove HCompareConstantEqAndBranch (never used), and its corresponding Lithium instructions.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 551b225f68260ac1111274b45e574a6f0fa01059..22a3efb96777c5ed5636c2741b4a321c3d5044d6 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -100,7 +100,6 @@ class LChunkBuilder;
   V(CompareGeneric)                            \
   V(CompareObjectEqAndBranch)                  \
   V(CompareMap)                                \
-  V(CompareConstantEqAndBranch)                \
   V(Constant)                                  \
   V(Context)                                   \
   V(DateField)                                 \
@@ -4017,29 +4016,6 @@ class HCompareObjectEqAndBranch: public HTemplateControlInstruction<2, 2> {
 };
 
 
-class HCompareConstantEqAndBranch: public HUnaryControlInstruction {
- public:
-  HCompareConstantEqAndBranch(HValue* left, int right, Token::Value op)
-      : HUnaryControlInstruction(left, NULL, NULL), op_(op), right_(right) {
-    ASSERT(op == Token::EQ_STRICT);
-  }
-
-  Token::Value op() const { return op_; }
-  HValue* left() { return value(); }
-  int right() const { return right_; }
-
-  virtual Representation RequiredInputRepresentation(int index) {
-    return Representation::Integer32();
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(CompareConstantEqAndBranch);
-
- private:
-  const Token::Value op_;
-  const int right_;
-};
-
-
 class HIsObjectAndBranch: public HUnaryControlInstruction {
  public:
   explicit HIsObjectAndBranch(HValue* value)