Cleanup INTEGER_INDEXED_EXOTIC handling a bit

test/mjsunit/es6/indexed-integer-exotics.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax
 
 Object.prototype["10"] = "unreachable";
 Object.prototype["7"] = "unreachable";
 Object.prototype["-1"] = "unreachable";
 Object.prototype["-0"] = "unreachable";
@@ skipping 37 matching lines @@
 check();
 
 function f() { return array["-1"]; }
 
 for (var i = 0; i < 3; i++) {
   assertEquals(undefined, f());
 }
 %OptimizeFunctionOnNextCall(f);
 assertEquals(undefined, f());
 
-Object.defineProperty(new Int32Array(), "-1", {'value': 1});
-Object.defineProperty(new Int32Array(), "-0", {'value': 1});
-Object.defineProperty(new Int32Array(), "-10", {'value': 1});
-Object.defineProperty(new Int32Array(), "4294967295", {'value': 1});
+assertThrows('Object.defineProperty(new Int32Array(100), -1, {value: 1})');
+// -0 gets converted to the string "0", so use "-0" instead.
+assertThrows('Object.defineProperty(new Int32Array(100), "-0", {value: 1})');
+assertThrows('Object.defineProperty(new Int32Array(100), -10, {value: 1})');
+assertThrows('Object.defineProperty(new Int32Array(), 4294967295, {value: 1})');
 
 check();