Fix store_mode bug involving polymorphism with external and JS arrays.

test/mjsunit/regress/external-and-normal-array-polymorphim.js

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-function createLargeCOWArray() {
-  var s = "[0";
-  // The constant below depends on the max object size in new space.
-  for (var i = 0; i < (128 << 10); i++) {
-    s += ",0";
+// Flags: --compiled_keyed_stores --compiled_transitions
+
+function store_generator(compare) {
+  return function(a,i,v) {
+    a[i] = v;
+    assertEquals(compare, a[i]);
+    assertEquals(compare, a[i]);
   }
-  s += "]";
-  return eval(s);
 }
 
-var large_cow_array = createLargeCOWArray();
+f = store_generator(5);
+a = [0,0,0];
+f(a,0,5);
+a = [0,0,0];
+f(a,1,5);
+a = [0,0,0];
+f(a,2,5);
 
-// Force copy. Because the array is large it will test the slow array
-// cloning in large object space.
-large_cow_array[17] = 42;
+f = store_generator(5.5);
+a = new Float32Array(5);
+f(a,0,5.5);
+f(a,1,5.5);
+f(a,2,5.5);