Regressions on trunk at revision 205722 vs revision 205719

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

New failures:

New passes:
FAIL: 17_intro/headers/c++200x/stdc++.cc (test for excess errors)
FAIL: 17_intro/headers/c++200x/stdc++.cc (test for excess errors)
FAIL: 17_intro/headers/c++200x/stdc++_multiple_inclusion.cc (test for excess errors)
FAIL: 17_intro/headers/c++200x/stdc++_multiple_inclusion.cc (test for excess errors)
FAIL: g++.dg/warn/pr15774-1.C -std=c++11  (test for errors, line 3)
FAIL: g++.dg/warn/pr15774-1.C -std=c++98  (test for errors, line 3)