Regressions on trunk at revision 171179 vs revision 171172

[H.J. Lu ia32]

New failures:
FAIL: gfortran.dg/scratch_1.f90  -O0  execution test
FAIL: gfortran.dg/scratch_1.f90  -O1  execution test
FAIL: gfortran.dg/scratch_1.f90  -O2  execution test
FAIL: gfortran.dg/scratch_1.f90  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/scratch_1.f90  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  execution test
FAIL: gfortran.dg/scratch_1.f90  -O3 -fomit-frame-pointer -funroll-loops  execution test
FAIL: gfortran.dg/scratch_1.f90  -O3 -g  execution test
FAIL: gfortran.dg/scratch_1.f90  -Os  execution test

New passes: