Regressions on master at commit r12-3534 vs commit r12-3501 on Linux/x86_64

[H.J. Lu]

New failures:

New passes:
FAIL: 29_atomics/atomic_flag/test_and_set/explicit-hle.cc (test for excess errors)
FAIL: g++.dg/ext/sync-4.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/ext/sync-4.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/ext/sync-4.C  -std=gnu++2a (test for excess errors)
FAIL: g++.dg/ext/sync-4.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/opt/reg-stack4.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/opt/reg-stack4.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/opt/reg-stack4.C  -std=gnu++2a (test for excess errors)
FAIL: g++.dg/opt/reg-stack4.C  -std=gnu++98 (test for excess errors)
FAIL: libitm.c++/dropref.C (test for excess errors)
FAIL: libitm.c++/eh-1.C (test for excess errors)
FAIL: libitm.c++/eh-2.C (test for excess errors)
FAIL: libitm.c++/eh-3.C (test for excess errors)
FAIL: libitm.c++/eh-4.C (test for excess errors)
FAIL: libitm.c++/eh-5.C (test for excess errors)
FAIL: libitm.c++/libstdc++-pr91488.C (test for excess errors)
FAIL: libitm.c++/libstdc++-safeexc.C (test for excess errors)
FAIL: libitm.c++/newdelete.C (test for excess errors)
FAIL: libitm.c++/throwdown.C (test for excess errors)