Don't throw on assignment to function name binding in harmony sloppy mode

test/mjsunit/harmony/regress/regress-4482.js

Index: test/mjsunit/harmony/regress/regress-4482.js
diff --git a/test/mjsunit/harmony/regress/regress-4482.js b/test/mjsunit/harmony/regress/regress-4482.js
new file mode 100644
index 0000000000000000000000000000000000000000..bffca42ecca7457c8816fd967c50be5b43db2ebd
--- /dev/null
+++ b/test/mjsunit/harmony/regress/regress-4482.js
@@ -0,0 +1,9 @@
+// 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-sloppy --nolegacy-const
+
+assertEquals("function", (function f() { f = 42; return typeof f })());
+assertEquals("function",
+             (function* g() { g = 42; yield typeof g })().next().value);