Regressions on trunk at revision 191586 vs revision 191585

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

New failures:

New passes:
FAIL: gcc.dg/pch/decl-2.c   -O2  -I. -Dwith_PCH (internal compiler error)
FAIL: gcc.dg/pch/decl-2.c   -O2  -I. -Dwith_PCH (test for excess errors)
FAIL: gcc.dg/pch/decl-2.c  -O2  assembly comparison