Ensure CopyElementsImpl is always executed so it fills in holes even if from_size is 0. Allow Fixed…

src/elements.cc

Index: src/elements.cc
diff --git a/src/elements.cc b/src/elements.cc
index 0f4d533f2e307ed613e5db4896a789d1286834d6..46a788bc84932683bad1d4ce0ddbf68f723d9e7e 100644
--- a/src/elements.cc
+++ b/src/elements.cc
@@ -696,9 +696,6 @@ class ElementsAccessorBase : public ElementsAccessor {
         }
       }
     }
-    if (from->length() == 0 || copy_size == 0) {
-      return from;
-    }
     return ElementsAccessorSubclass::CopyElementsImpl(
         from, from_start, to, to_kind, to_start, packed_size, copy_size);
   }