Adds support for UseDartApi vm test on MIPS.

runtime/vm/disassembler_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 #include "platform/assert.h"
 
@@ skipping 614 matching lines @@
       break;
     }
     case SW: {
       Format(instr, "sw 'rt, 'imms('rs)");
       break;
     }
     case SWC1: {
       Format(instr, "swc1 'ft, 'imms('rs)");
       break;
     }
+    case XORI: {
+      Format(instr, "xori 'rt, 'rs, 'immu");
+      break;
+    }
     default: {
       Unknown(instr);
       break;
     }
   }
 }
 
 
 void Disassembler::DecodeInstruction(char* hex_buffer, intptr_t hex_size,
                                      char* human_buffer, intptr_t human_size,
@@ skipping 38 matching lines @@
                                   pc);
     pc += instruction_length;
   }
 
   return;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS