Optimize __directory_iterator_proxy for the common case

	* include/experimental/bits/fs_dir.h (__directory_iterator_proxy):
	Overload operator* to move from rvalues.

From-SVN: r236078

libstdc++-v3/ChangeLog

 2016-05-10  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/experimental/bits/fs_dir.h (__directory_iterator_proxy):
+	Overload operator* to move from rvalues.
+
 	PR libstdc++/71036
 	* src/filesystem/ops.cc (create_dir): Handle EEXIST from mkdir.
 	* testsuite/experimental/filesystem/operations/create_directory.cc:

libstdc++-v3/include/experimental/bits/fs_dir.h

@@ -158,7 +158,9 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
 
   struct __directory_iterator_proxy
   {
-    const directory_entry& operator*() const noexcept { return _M_entry; }
+    const directory_entry& operator*() const& noexcept { return _M_entry; }
+
+    directory_entry operator*() && noexcept { return std::move(_M_entry); }
 
   private:
     friend class directory_iterator;