Ensure double arrays are filled with holes when extended from variations of empty arrays.

test/mjsunit/regress/regress-crbug-162085.js

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-// Test that we correctly restore the stack when continuing from a
-// finally block inside a for-in.
+// Ensure extending an empty packed smi array with a double initializes the
+// array with holes.
+var a = [1,2,3];
+a.length = 0;
+a[0] = 1.4;
+assertEquals(undefined, a[1]);
+assertEquals(undefined, a[2]);
+assertEquals(undefined, a[3]);
 
-var f = 0;
-var a = [1, 2, 3];
+// Ensure the double array growstub initializes the array with holes.
+function grow_store(a,i,v) {
+  a[i] = v;
+}
 
-for (x in a) {
-  try{
-    throw 'error';
-  } finally {
-    f++;
-    continue;
-  }
-}
-assertEquals(3, f);
+var a2 = [1.3];
+grow_store(a2,1,1.4);
+a2.length = 0;
+grow_store(a2,0,1.5);
+assertEquals(undefined, a2[1]);
+assertEquals(undefined, a2[2]);
+assertEquals(undefined, a2[3]);
 
-f = 0;
-for (x in a) {
-  try {
-    f++;
-  } finally {
-    f++;
-    continue;
-  }
-}
-assertEquals(6, f);
-
-f = 0;
-for (x in a) {
-  try {
-    f++;
-  } finally {
-    try {
-      throw 'error'
-    } finally {
-      try {
-        f++;
-      } finally {
-        f++;
-        continue;
-      }
-    }
-  }
-}
-assertEquals(9, f);
+// Check storing objects using the double grow stub.
+var a3 = [1.3];
+var o = {};
+grow_store(a3, 1, o);
+assertEquals(1.3, a3[0]);
+assertEquals(o, a3[1]);