MIPS: Merge IR classes for different bitwise operations AND, OR and XOR into one class.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index 0b44fb2a73b3ab5e5ac9a5ea694668068d23f7f2..71f0bb22fc37b6be1f6c09ac1e53c376f8b300b6 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -796,18 +796,15 @@ class LBoundsCheck: public LTemplateInstruction<0, 2, 0> {
 
 class LBitI: public LTemplateInstruction<1, 2, 0> {
  public:
-  LBitI(Token::Value op, LOperand* left, LOperand* right)
-      : op_(op) {
+  LBitI(LOperand* left, LOperand* right) {
     inputs_[0] = left;
     inputs_[1] = right;
   }
 
-  Token::Value op() const { return op_; }
+  Token::Value op() const { return hydrogen()->op(); }
 
   DECLARE_CONCRETE_INSTRUCTION(BitI, "bit-i")
-
- private:
-  Token::Value op_;
+  DECLARE_HYDROGEN_ACCESSOR(Bitwise)
 };