Add a kSimd128 machine type for Turbofan.

src/mips/assembler-mips.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 286 matching lines @@
     reg_code = f;
     DCHECK(is_valid());
   }
   // Unfortunately we can't make this private in a struct.
   int reg_code;
 };
 
 const FPUControlRegister no_fpucreg = { kInvalidFPUControlRegister };
 const FPUControlRegister FCSR = { kFCSRRegister };
 
+// TODO(mips) Define SIMD registers.
+typedef DoubleRegister Simd128Register;
 
 // -----------------------------------------------------------------------------
 // Machine instruction Operands.
 
 // Class Operand represents a shifter operand in data processing instructions.
 class Operand BASE_EMBEDDED {
  public:
   // Immediate.
   INLINE(explicit Operand(int32_t immediate,
          RelocInfo::Mode rmode = RelocInfo::NONE32));
@@ skipping 1121 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_ASSEMBLER_MIPS_H_