ElementsAccessor::CopyElements() and its callers handlified.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 35fed0a4b329a6a99913674112485bae9cf3922c..7f6d5ee32f0e88aad36409c5ecf0e0c8eba3a686 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3135,6 +3135,8 @@ class FixedDoubleArray: public FixedArrayBase {
   inline double get_scalar(int index);
   inline int64_t get_representation(int index);
   MUST_USE_RESULT inline MaybeObject* get(int index);
+  // TODO(ishell): Rename as get() once all usages handlified.
+  inline Handle<Object> get_as_handle(int index);
   inline void set(int index, double value);
   inline void set_the_hole(int index);