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

test/mjsunit/array-store-and-grow.js

Index: test/mjsunit/array-store-and-grow.js
diff --git a/test/mjsunit/array-store-and-grow.js b/test/mjsunit/array-store-and-grow.js
index 131d4ebc512d9f022238e5ff258447f7b05928de..88f3db8f646ca93f12676ccd601d0a1372246bc5 100644
--- a/test/mjsunit/array-store-and-grow.js
+++ b/test/mjsunit/array-store-and-grow.js
@@ -99,7 +99,10 @@ array_store_5(a, 1, 0.5);
 a = makeCOW();
 array_store_5(a, 1, 0.5);
 assertEquals(0.5, a[1]);
-assertEquals(0.5, array_store_5([], 1, 0.5));
+a = [];
+assertEquals(0.5, array_store_5(a, 1, 0.5));
+assertEquals(undefined, a[0]);
+assertEquals(0.5, a[1]);
 
 function array_store_6(a,b,c) {
   return (a[b] = c);