Regressions on trunk at revision 267631 vs revision 267591

[H.J. Lu]

New failures:
FAIL: 27_io/filesystem/operations/last_write_time.cc execution test
FAIL: gfortran.dg/pr79966.f90   -O   scan-ipa-dump inline "Inlined tp_sum/[0-9]+ into runtptests/[0-9]+"
FAIL: gfortran.dg/pr79966.f90   -O   scan-ipa-dump inline "Inlined tp_sum/[0-9]+ into runtptests/[0-9]+"
FAIL: libstdc++-prettyprinters/cxx17.cc print v2
FAIL: libstdc++-prettyprinters/cxx17.cc print v2
FAIL: libstdc++-prettyprinters/cxx17.cc print v2
FAIL: libstdc++-prettyprinters/cxx17.cc print v2

New passes:
FAIL: c-c++-common/attributes-4.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/attributes-4.c  -std=gnu++17 (test for excess errors)
FAIL: c-c++-common/attributes-4.c  -std=gnu++98 (test for excess errors)
FAIL: c-c++-common/attributes-4.c  -Wc++-compat  (test for excess errors)