Fix semantic of C++ 11 inline namespaces.

Add the declaring `inline' namespace to the `using list' of its
enclosing namespace symbol. This should be enough to ensure
the correct visibility of the symbols declarated in the inlined
namespace.

Change-Id: Id4de74577c498fe439a49709a306ef0deb145988
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

tests/auto/cplusplus/cxx11/data/inlineNamespace.1.cpp

@@ -0,0 +1,5 @@
+
+inline namespace zoo {
+    void foo();
+}
+