Avoid trying to decode the raw inline constant which is part of the aged code prologue.

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 1661 matching lines @@
   if (instr->ConditionField() == kSpecialCondition) {
     DecodeSpecialCondition(instr);
     return Instruction::kInstrSize;
   }
   int instruction_bits = *(reinterpret_cast<int*>(instr_ptr));
   if ((instruction_bits & kConstantPoolMarkerMask) == kConstantPoolMarker) {
     out_buffer_pos_ += OS::SNPrintF(out_buffer_ + out_buffer_pos_,
                                     "constant pool begin (length %d)",
                                     DecodeConstantPoolLength(instruction_bits));
     return Instruction::kInstrSize;
+  } else if (instruction_bits == kCodeAgeJumpInstruction) {
+    // The code age prologue has a constant immediatly following the jump
+    // instruction.
+    Instruction* target = Instruction::At(instr_ptr + Instruction::kInstrSize);
+    DecodeType2(instr);
+    OS::SNPrintF(out_buffer_ + out_buffer_pos_,
+                 " (0x%08x)", target->InstructionBits());
+    return 2 * Instruction::kInstrSize;
   }
   switch (instr->TypeValue()) {
     case 0:
     case 1: {
       DecodeType01(instr);
       break;
     }
     case 2: {
       DecodeType2(instr);
       break;
@@ skipping 103 matching lines @@
     v8::internal::PrintF(
         f, "%p    %08x      %s\n",
         prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_ARM