Enable stub generation using Hydrogen/Lithium (again)

src/smart-pointers.h

Index: src/smart-pointers.h
diff --git a/src/smart-pointers.h b/src/smart-pointers.h
index 345c4d47fb73e8d3e0c10c7f80fc87530876dbb3..fea4595ac71705f3e8a05d6ac58837d926fe60eb 100644
--- a/src/smart-pointers.h
+++ b/src/smart-pointers.h
@@ -63,6 +63,11 @@ class SmartPointerBase {
     return p_[i];
   }
 
+  // You can use [n] to index as if it was a plain pointer
+  const inline T& operator[](size_t i) const {
+    return p_[i];
+  }
+
   // We don't have implicit conversion to a T* since that hinders migration:
   // You would not be able to change a method from returning a T* to
   // returning an SmartArrayPointer<T> and then get errors wherever it is used.