libstdc++: Implement LWG 3796 changes to repeat_/chunk_by_view [PR109024]

	PR libstdc++/109024

libstdc++-v3/ChangeLog:

	* include/std/ranges (chunk_by_view::_M_pred): Remove DMI as per
	LWG 3796.
	(repeat_view::_M_pred): Likewise.
	* testsuite/std/ranges/adaptors/chunk_by/1.cc (test03): New test.
	* testsuite/std/ranges/repeat/1.cc (test05): New test.