Fix invalid loop condition for Array.lastIndexOf().

test/mjsunit/regress/regress-crbug-380512.js

Index: test/mjsunit/regress/regress-crbug-380512.js
diff --git a/test/mjsunit/regress/regress-alloc-smi-check.js b/test/mjsunit/regress/regress-crbug-380512.js
similarity index 72%
copy from test/mjsunit/regress/regress-alloc-smi-check.js
copy to test/mjsunit/regress/regress-crbug-380512.js
index 295048a13ef862ceb21939de104e7968dd7772da..af78ba7183abebad0178de169592c276f95f03c7 100644
--- a/test/mjsunit/regress/regress-alloc-smi-check.js
+++ b/test/mjsunit/regress/regress-crbug-380512.js
@@ -1,16 +1,12 @@
 // 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
 
-var x = {};
+// Flags: --allow-natives-syntax
 
-function f(a) {
-  a[200000000] = x;
-}
+function f() { [].lastIndexOf(42); }
 
-f(new Array(100000));
-f([]);
+f();
+f();
 %OptimizeFunctionOnNextCall(f);
-f([]);
+f();