Regressions on trunk at revision 191694 vs revision 191693

[H.J. Lu ia32 Core 2/i7]

New failures:

New passes:
FAIL: gcc.dg/pch/ident-1.c   -O0  -I. -Dwith_PCH (internal compiler error)
FAIL: gcc.dg/pch/ident-1.c   -O0  -I. -Dwith_PCH (test for excess errors)
FAIL: gcc.dg/pch/ident-1.c  -O0  assembly comparison