Implement native call stub on ARM and native call redirection in ARM simulator.

runtime/vm/simulator_arm.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Declares a Simulator for ARM instructions if we are not generating a native
 // ARM binary. This Simulator allows us to run and debug ARM code generation on
 // regular desktop machines.
 // Dart calls into generated code by "calling" the InvokeDartCode stub,
 // which will start execution in the Simulator or forwards to the real entry
 // on a ARM HW platform.
@@ skipping 58 matching lines @@
                int32_t parameter1,
                int32_t parameter2,
                int32_t parameter3);
 
   // Implementation of atomic compare and exchange in the same synchronization
   // domain as other synchronization primitive instructions (e.g. ldrex, strex).
   static uword CompareExchange(uword* address,
                                uword compare_value,
                                uword new_value);
 
-  // Runtime call support.
-  static uword RedirectExternalReference(uword function,
-                                         uint32_t argument_count);
+  // Runtime and native call support.
+  enum CallKind {
+    kRuntimeCall,
+    kNativeCall
+  };
+  static uword RedirectExternalReference(uword function, CallKind call_kind);
 
   void Longjmp(int32_t pc, int32_t sp, int32_t fp, const Instance& object);
 
  private:
   // Known bad pc value to ensure that the simulator does not execute
   // without being properly setup.
   static const uword kBadLR = -1;
   // A pc value used to signal the simulator to stop execution.  Generally
   // the lr is set to this value on transition from native C code to
   // simulated execution, so that the simulator can "return" to the native
@@ skipping 129 matching lines @@
   }
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_ARM_H_