Fix r19564: Don't free decoder_ in ~Simulator().

src/a64/simulator-a64.cc

 // Copyright 2013 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 406 matching lines @@
 
 
 Simulator::~Simulator() {
   delete[] stack_;
   if (FLAG_log_instruction_stats) {
     delete instrument_;
   }
   delete disassembler_decoder_;
   delete print_disasm_;
   DeleteArray(last_debugger_input_);
-  delete decoder_;
 }
 
 
 void Simulator::Run() {
   pc_modified_ = false;
   while (pc_ != kEndOfSimAddress) {
     ExecuteInstruction();
   }
 }
 
@@ skipping 2991 matching lines @@
     default:
       UNIMPLEMENTED();
   }
 }
 
 #endif  // USE_SIMULATOR
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64