Fix for failing asserts in HBoundsCheck code generation on x64: index register should be zero exten…

test/mjsunit/regress/regress-crbug-345820.js

Index: test/mjsunit/regress/regress-crbug-345820.js
diff --git a/test/mjsunit/regress/regress-crbug-345820.js b/test/mjsunit/regress/regress-crbug-345820.js
new file mode 100644
index 0000000000000000000000000000000000000000..bdd0af9b12db3340263c47f40e3d0b5f1eb84172
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-345820.js
@@ -0,0 +1,18 @@
+// 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 --debug-code
+
+var __v_6 = {};
+__v_6 = new Int32Array(5);
+for (var i = 0; i < __v_6.length; i++) __v_6[i] = 0;
+
+function __f_7(N) {
+  for (var i = -1; i < N; i++) {
+    __v_6[i] = i;
+  }
+}
+__f_7(1);
+%OptimizeFunctionOnNextCall(__f_7);
+__f_7(__v_6.length);