[MIPS] Refactoring code for disassembler

Code for mips64 is merged with code for mips.

Change-Id: I2e3f2118c69a189787ae8e7f09adb4ee5c0d00d9
diff --git a/disassembler/disassembler_mips.h b/disassembler/disassembler_mips.h
index 00b2f8d..67c3fcb 100644
--- a/disassembler/disassembler_mips.h
+++ b/disassembler/disassembler_mips.h
@@ -26,12 +26,15 @@
 
 class DisassemblerMips FINAL : public Disassembler {
  public:
-  explicit DisassemblerMips(DisassemblerOptions* options) : Disassembler(options) {}
+  explicit DisassemblerMips(DisassemblerOptions* options, bool is64bit) : Disassembler(options),
+      is64bit_(is64bit) {}
 
   size_t Dump(std::ostream& os, const uint8_t* begin) OVERRIDE;
   void Dump(std::ostream& os, const uint8_t* begin, const uint8_t* end) OVERRIDE;
 
  private:
+  const bool is64bit_;
+
   DISALLOW_COPY_AND_ASSIGN(DisassemblerMips);
 };