Merge experimental/a64 to bleeding_edge.

src/arm/simulator-arm.h

 // Copyright 2012 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 189 matching lines @@
   }
 
   int get_sinteger_from_s_register(int sreg) {
     return GetFromVFPRegister<int, 1>(sreg);
   }
 
   // Special case of set_register and get_register to access the raw PC value.
   void set_pc(int32_t value);
   int32_t get_pc() const;
 
+  Address get_sp() {
+    return reinterpret_cast<Address>(static_cast<intptr_t>(get_register(sp)));
+  }
+
   // Accessor to the internal simulator stack area.
   uintptr_t StackLimit() const;
 
   // Executes ARM instructions until the PC reaches end_sim_pc.
   void Execute();
 
   // Call on program start.
   static void Initialize(Isolate* isolate);
 
   // V8 generally calls into generated JS code with 5 parameters and into
@@ skipping 259 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_ARM_SIMULATOR_ARM_H_