Regressions on trunk at revision 210518 vs revision 210515

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: 20_util/make_unsigned/requirements/typedefs-1.cc (test for excess errors)
FAIL: 20_util/make_unsigned/requirements/typedefs-2.cc (test for excess errors)
FAIL: tr1/2_general_utilities/shared_ptr/modifiers/reset_neg.cc  (test for errors, line 36)
FAIL: tr1/2_general_utilities/shared_ptr/modifiers/reset_neg.cc  (test for errors, line 36)