typeck.c (decl_in_std_namespace_p): Return true also for decls in inline namespaces inside of std namespace.

	* typeck.c (decl_in_std_namespace_p): Return true also for decls
	in inline namespaces inside of std namespace.

	* g++.dg/cpp0x/Wpessimizing-move6.C: New test.

From-SVN: r277648