A64: Restore the stack limit protection to 1KB.

src/a64/simulator-a64.h

 // 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 815 matching lines @@
     return result == 0;
   }
 
   static const uint32_t kConditionFlagsMask = 0xf0000000;
 
   // Stack
   byte* stack_;
   static const intptr_t stack_protection_size_ = KB;
   intptr_t stack_size_;
   byte* stack_limit_;
-  // TODO(aleram): protect the stack.
 
   Decoder<DispatchingDecoderVisitor>* decoder_;
   Decoder<DispatchingDecoderVisitor>* disassembler_decoder_;
 
   // Indicates if the pc has been modified by the instruction and should not be
   // automatically incremented.
   bool pc_modified_;
   Instruction* pc_;
 
   static const char* xreg_names[];
@@ skipping 53 matching lines @@
   static void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 #endif  // !defined(USE_SIMULATOR)
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_SIMULATOR_A64_H_