Optimise std::list::assign(initializer_list<T>) slightly

	* include/bits/stl_list.h (assign(initializer_list<value_type>)): Call
	_M_assign_dispatch directly with correct tag.

From-SVN: r240984

libstdc++-v3/ChangeLog

 2016-10-11  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/stl_list.h (assign(initializer_list<value_type>)): Call
+	_M_assign_dispatch directly with correct tag.
+
 	* doc/xml/manual/intro.xml: Document LWG 2484 status.
 	* libsupc++/nested_exception.h (_Throw_with_nested_impl)
 	(_Throw_with_nested_helper): Remove.

libstdc++-v3/include/bits/stl_list.h

@@ -830,7 +830,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        */
       void
       assign(initializer_list<value_type> __l)
-      { this->assign(__l.begin(), __l.end()); }
+      { this->_M_assign_dispatch(__l.begin(), __l.end(), __false_type()); }
 #endif
 
       /// Get a copy of the memory allocation object.