Regressions on trunk at revision 202823 vs revision 202822

[H.J. Lu Intel64 Core 2/i7]

New failures:
FAIL: 27_io/basic_ios/imbue/14072.cc (test for excess errors)
FAIL: g++.dg/debug/pr27657.C -gstabs -O2 (test for excess errors)
FAIL: g++.old-deja/g++.other/new6.C -std=c++98 (test for excess errors)

New passes: