Regressions on trunk at revision 251368 vs revision 251362

[H.J. Lu Intel64 Core i7]

New failures:
FAIL: 30_threads/thread/70503.cc (test for excess errors)
FAIL: ext/mt_allocator/tune-1.cc execution test
FAIL: ext/mt_allocator/tune-1.cc (test for excess errors)
FAIL: g++.dg/ext/mv21.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/mv21.C  -std=gnu++11 (test for excess errors)
FAIL: g++.dg/ext/mv21.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/mv21.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/ext/mv21.C  -std=gnu++98 execution test
FAIL: g++.dg/ext/mv21.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/ext/mv22.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/mv22.C  -std=gnu++11 (test for excess errors)
FAIL: g++.dg/ext/mv22.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/mv22.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/ext/mv22.C  -std=gnu++98 execution test
FAIL: g++.dg/ext/mv22.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/ext/mv23.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/mv23.C  -std=gnu++11 (test for excess errors)
FAIL: g++.dg/ext/mv23.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/mv23.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/ext/mv23.C  -std=gnu++98 execution test
FAIL: g++.dg/ext/mv23.C  -std=gnu++98 (test for excess errors)
FAIL: libstdc++-abi/abi_check

New passes: