Clean up stack guard interrupts.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 97854f22eb5b74df4b55da4d37ddf4855180647b..35307ccf743fe37ec648913221dd57ff55fecccd 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -359,6 +359,8 @@ typedef List<HeapObject*> DebugObjectCache;
   V(int, max_available_threads, 0)                                             \
   V(uint32_t, per_isolate_assert_data, 0xFFFFFFFFu)                            \
   V(DebuggerAgent*, debugger_agent_instance, NULL)                             \
+  V(InterruptCallback, api_interrupt_callback, NULL)                           \
+  V(void*, api_interrupt_callback_data, NULL)                                  \
   ISOLATE_INIT_SIMULATOR_LIST(V)
 
 #define THREAD_LOCAL_TOP_ACCESSOR(type, name)                        \
@@ -758,6 +760,8 @@ class Isolate {
   Object* TerminateExecution();
   void CancelTerminateExecution();
 
+  void InvokeApiInterruptCallback();
+
   // Administration
   void Iterate(ObjectVisitor* v);
   void Iterate(ObjectVisitor* v, ThreadLocalTop* t);