Make Isolate::GetStackSample API support simulator

src/profiler/sampler.h

Index: src/profiler/sampler.h
diff --git a/src/profiler/sampler.h b/src/profiler/sampler.h
index f6804f8e25f7aa0a328a64b746cd8251115cad90..04c8f0446cb940d1397e33e4247e87ad77759139 100644
--- a/src/profiler/sampler.h
+++ b/src/profiler/sampler.h
@@ -141,6 +141,16 @@ class Sampler {
 };
 
 
+#if defined(USE_SIMULATOR)
+class SimulatorHelper : AllStatic {
+ public:
+  // Returns true if register values were successfully retrieved
+  // from the simulator, otherwise returns false.
+  static bool FillRegisters(Isolate* isolate, v8::RegisterState* state);
+};
+#endif  // USE_SIMULATOR
+
+
 }  // namespace internal
 }  // namespace v8