Merge r19847 and r19893 to 3.23 branch.

test/mjsunit/regress/regress-350884.js

Index: test/mjsunit/regress/regress-350884.js
diff --git a/test/mjsunit/regress/regress-350884.js b/test/mjsunit/regress/regress-350884.js
new file mode 100644
index 0000000000000000000000000000000000000000..86568534ee705e0adfb945912dde5e1487b192a7
--- /dev/null
+++ b/test/mjsunit/regress/regress-350884.js
@@ -0,0 +1,15 @@
+// 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.
+
+var obj = new Array(1);
+obj[0] = 0;
+obj[1] = 0;
+function foo(flag_index) {
+  obj[flag_index]++;
+}
+
+// Force dictionary properties on obj.
+obj[-8] = 3;
+foo(1);
+foo(2);