Bug: Runtime_GrowArrayElements provoked unnecessary lazy deopt.

test/mjsunit/regress/regress-488398.js

Index: test/mjsunit/regress/regress-488398.js
diff --git a/test/mjsunit/regress/regress-488398.js b/test/mjsunit/regress/regress-488398.js
new file mode 100644
index 0000000000000000000000000000000000000000..77ea293a263540042e8c203a09ff3193022efe59
--- /dev/null
+++ b/test/mjsunit/regress/regress-488398.js
@@ -0,0 +1,18 @@
+// Copyright 2015 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 __v_10 = 4294967295;
+__v_0 = [];
+__v_0.__proto__ = [];
+__v_16 = __v_0;
+function __f_17(__v_16, base) {
+  __v_16[base + 1] = 1;
+  __v_16[base + 4] = base + 4;
+}
+__f_17(__v_16, true);
+__f_17(__v_16, 14);
+%OptimizeFunctionOnNextCall(__f_17);
+__f_17(__v_16, 2048);