A64: Synchronize with r15814.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index f5a94aa5eba0afeea570ddcd7621de36b8b48f06..c84ad02f515785c910f261ab3a0daf7c558d2b06 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -125,6 +125,15 @@ typedef ZoneList<Handle<Object> > ZoneObjectList;
     }                                                     \
   } while (false)
 
+#define RETURN_HANDLE_IF_SCHEDULED_EXCEPTION(isolate, T)  \
+  do {                                                    \
+    Isolate* __isolate__ = (isolate);                     \
+    if (__isolate__->has_scheduled_exception()) {         \
+      __isolate__->PromoteScheduledException();           \
+      return Handle<T>::null();                           \
+    }                                                     \
+  } while (false)
+
 #define RETURN_IF_EMPTY_HANDLE_VALUE(isolate, call, value) \
   do {                                                     \
     if ((call).is_null()) {                                \
@@ -1126,6 +1135,11 @@ class Isolate {
     function_entry_hook_ = function_entry_hook;
   }
 
+  void* stress_deopt_count_address() { return &stress_deopt_count_; }
+
+  // Given an address occupied by a live code object, return that object.
+  Object* FindCodeObject(Address a);
+
  private:
   Isolate();
 
@@ -1362,6 +1376,9 @@ class Isolate {
   SweeperThread** sweeper_thread_;
   CallbackTable* callback_table_;
 
+  // Counts deopt points if deopt_every_n_times is enabled.
+  unsigned int stress_deopt_count_;
+
   friend class ExecutionAccess;
   friend class HandleScopeImplementer;
   friend class IsolateInitializer;