Regressions on trunk at revision 245828 vs revision 245804

[H.J. Lu]

New failures:
FAIL: ext/shared_ptr/1.cc (test for excess errors)
FAIL: ext/slist/23781_neg.cc  (test for errors, line 27)
FAIL: ext/slist/23781_neg.cc  (test for errors, line 28)
FAIL: ext/slist/23781_neg.cc (test for excess errors)
FAIL: ext/slist/check_construct_destroy.cc (test for excess errors)
FAIL: ext/slist/requirements/explicit_instantiation.cc (test for excess errors)
FAIL: ext/special_functions/conf_hyperg/check_nan.cc (test for excess errors)
FAIL: ext/special_functions/conf_hyperg/check_value.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/char/12048-1.cc (test for excess errors)
FAIL: gcc.dg/pr57134.c (test for excess errors)

New passes: