Regressions on trunk at revision 250370 vs revision 250362

[H.J. Lu Intel64 Core i7]

New failures:

New passes:
FAIL: 21_strings/basic_string/modifiers/insert/wchar_t/1.cc execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++98 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++98 execution test