Temporarily add more test output to help locate test failure

src/arm/disasm-arm.cc

 // Copyright 2011 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 974 matching lines @@
       } else if (!instr->HasW() && (instr->Bits(6, 4) == 0x1)) {
         uint32_t lsbit = static_cast<uint32_t>(instr->Bits(11, 7));
         uint32_t msbit = static_cast<uint32_t>(instr->Bits(20, 16));
         if (msbit >= lsbit) {
           if (instr->RmValue() == 15) {
             Format(instr, "bfc'cond 'rd, 'f");
           } else {
             Format(instr, "bfi'cond 'rd, 'rm, 'f");
           }
         } else {
+          PrintF("%08x\n", instr->InstructionBits());
           UNREACHABLE();
         }
       } else {
         Format(instr, "'memop'cond'b 'rd, ['rn, +'shift_rm]'w");
       }
       break;
     }
     default: {
       // The PU field is a 2-bit field.
       UNREACHABLE();
@@ skipping 492 matching lines @@
     pc += d.InstructionDecode(buffer, pc);
     fprintf(f, "%p    %08x      %s\n",
             prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_ARM