Regressions on trunk at revision 172724 vs revision 172712

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/guality/vla-1.c  -O2 -flto -flto-partition=none  line 17 sizeof (a) == 6
FAIL: gfortran.dg/module_write_1.f90  -O  (internal compiler error)
FAIL: gfortran.dg/module_write_1.f90  -O  (test for excess errors)

New passes: