Make Isolate::GetStackSample API support simulator

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 83b777d30948104bec43ba3c9926cd68ff637690..8cfa2fd3c62685227f1a14947202b65c081fd948 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5800,6 +5800,9 @@ class V8_EXPORT Isolate {
   void GetStackSample(const RegisterState& state, void** frames,
                       size_t frames_limit, SampleInfo* sample_info);
 
+  void GetStackSample(RegisterState* state, void** frames,

[alph, 2016/04/27 22:29:20]

Why do you need the second one?
Can it once being run under the simulator just ignore the state arg and extract
one from the simulator?

+                      size_t frames_limit, SampleInfo* sample_info);
+
   /**
    * Adjusts the amount of registered external memory. Used to give V8 an
    * indication of the amount of externally allocated memory that is kept alive