ARM: Fix a number of issues with running without VFPv3 support

src/arm/simulator-arm.h

 // 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 137 matching lines @@
 
   // The currently executing Simulator instance. Potentially there can be one
   // for each native thread.
   static Simulator* current(v8::internal::Isolate* isolate);
 
   // Accessors for register state. Reading the pc value adheres to the ARM
   // architecture specification and is off by a 8 from the currently executing
   // instruction.
   void set_register(int reg, int32_t value);
   int32_t get_register(int reg) const;
+  double get_double_from_register_pair(int reg);
   void set_dw_register(int dreg, const int* dbl);
 
   // Support for VFP.
   void set_s_register(int reg, unsigned int value);
   unsigned int get_s_register(int reg) const;
   void set_d_register_from_double(int dreg, const double& dbl);
   double get_double_from_d_register(int dreg);
   void set_s_register_from_float(int sreg, const float dbl);
   float get_float_from_s_register(int sreg);
   void set_s_register_from_sinteger(int reg, const int value);
@@ skipping 236 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_ARM_SIMULATOR_ARM_H_