Regressions on trunk at revision 250585 vs revision 250570

[H.J. Lu ia32 Core i7]

New failures:
FAIL: 27_io/basic_fstream/53984.cc execution test

New passes:
ERROR: 27_io/basic_fstream/53984.cc: unknown dg option: dg-require-file-io 18 {} for " dg-require-file-io 18 "" "
ERROR: 27_io/basic_fstream/53984.cc: unknown dg option: dg-require-file-io 18 {} for " dg-require-file-io 18 "" "