PR libstdc++/64368
	* config/locale/gnu/numeric_members.cc (numpunct<char>::~numpunct(),
	numpunct<wchar_t>::~numpunct()): Do not set _M_data->_M_grouping.
	* src/c++11/cxx11-shim_facets.cc (numpunct_shim): Remove _M_grouping
	and use cache's _M_grouping field.
	(__numpunct_fill_cache): Likewise.
	(__moneypunct_fill_cache): Improve comments.

From-SVN: r220143