Regressions on trunk at revision 173736 vs revision 173735

[H.J. Lu Intel64 LTO/FDO]

New failures:
FAIL: gfortran.dg/assign_8.f90  -O   (test for errors, line 3)
FAIL: gfortran.dg/assign_8.f90  -O   (test for errors, line 3)
FAIL: gfortran.dg/assign_8.f90  -O  (test for excess errors)
FAIL: gfortran.dg/assign_8.f90  -O  (test for excess errors)

New passes: