Regressions on trunk at revision 253161 vs revision 253153

[H.J. Lu x32]

New failures:
FAIL: compiler driver --help=fortran option(s): "^ +-.*[^:.]$" absent from output: "  -Wdo-subscript              Warn about possibly incorrect subscripts in do loops"
FAIL: compiler driver --help=warnings option(s): "^ +-.*[^:.]$" absent from output: "  -Wdo-subscript              Warn about possibly incorrect subscripts in do loops"
FAIL: gfortran.dg/gomp/associate1.f90   -O  (test for excess errors)
FAIL: gfortran.dg/predcom-1.f   -O  (test for excess errors)
FAIL: gfortran.dg/unconstrained_commons.f   -O  (test for excess errors)

New passes: