Fix spread operator in ArrayLiterals when nested in other literals

test/mjsunit/harmony/regress/regress-4417.js

Index: test/mjsunit/harmony/regress/regress-4417.js
diff --git a/test/mjsunit/harmony/regress/regress-4417.js b/test/mjsunit/harmony/regress/regress-4417.js
new file mode 100644
index 0000000000000000000000000000000000000000..fb773f5face080245ebb0c20ab530fad1e559987
--- /dev/null
+++ b/test/mjsunit/harmony/regress/regress-4417.js
@@ -0,0 +1,12 @@
+// 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: --harmony-spread-arrays
+
+var arr = [1, 2, 3];
+assertEquals({arr: [1, 2, 3]}, {arr: [...arr]});
+assertEquals([[1, 2, 3]], [[...arr]]);
+
+assertEquals({arr: [6, 5, [1, 2, 3]]}, {arr: [6, 5, [...arr]]});
+assertEquals([8, 7, [6, 5, [1, 2, 3]]], [8, 7, [6, 5, [...arr]]]);