Fix bug in deletion of indexed properties

test/mjsunit/delete-non-configurable.js

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-// Flags: --allow-natives-syntax
+// Delete elements of a String object.
+var TIPLI = "tipli"
+var so = new String(TIPLI);
+var length = so.length;
 
-length = 1 << 16;
-a = new Array(length);
-
-function insert_element(key) {
-  a[key] = 42;
+for (var i = 0; i < length; i++) {
+  assertFalse(delete so[i]);
+  assertThrows("'use strict'; delete so[i];", TypeError);
+  assertFalse(delete so[i.toString()]);
+  assertThrows("'use strict'; delete so[i.toString()];", TypeError);
 }
 
-insert_element(1);
-%OptimizeFunctionOnNextCall(insert_element);
-insert_element(new Object());
-count = 0;
+assertEquals(length, so.length);
+assertEquals(new String(TIPLI), so);
+
+// Delete elements of an Array.
+var arr = new Array(length);
+
 for (var i = 0; i < length; i++) {
-  if (a[i] != undefined) count++;
+  arr[i] = i;
+  Object.defineProperty(arr, i, { configurable: false });
 }
-assertEquals(1, count);
+
+for (var i = 0; i < length; i++) {
+  assertFalse(delete arr[i]);
+  assertThrows("'use strict'; delete arr[i];", TypeError);
+  assertFalse(delete arr[i.toString()]);
+  assertThrows("'use strict'; delete arr[i.toString()];", TypeError);
+  assertEquals(i, arr[i]);
+}
+
+assertEquals(length, arr.length);
+assertTrue(delete arr[length]);
+
+// Delete an element of an Object.
+var INDEX = 28;
+var obj = new Object();
+
+obj[INDEX] = TIPLI;
+Object.defineProperty(obj, INDEX, { configurable: false });
+
+assertFalse(delete obj[INDEX]);
+assertThrows("'use strict'; delete obj[INDEX];", TypeError);
+assertFalse(delete obj[INDEX.toString()]);
+assertThrows("'use strict'; delete obj[INDEX.toString()];", TypeError);
+assertEquals(TIPLI, obj[INDEX]);
+assertTrue(delete arr[INDEX+1]);