Regressions on trunk at revision 212336 vs revision 212329

[i64coreavxi@ecsmtp.ims.intel.com]

New failures:
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f   -O   scan-tree-dump-times pcom "Executing predictive commoning without unrolling" 1
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f   -O   scan-tree-dump-times pcom "Executing predictive commoning without unrolling" 2
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f   -O   scan-tree-dump-times pcom "Predictive commoning failed: no suitable chains" 0
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f   -O   scan-tree-dump-times pcom "Predictive commoning failed: no suitable chains" 0

New passes:
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f scan-tree-dump-times pcom "Executing predictive commoning without unrolling" 1
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f scan-tree-dump-times pcom "Executing predictive commoning without unrolling" 2
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f scan-tree-dump-times pcom "Predictive commoning failed: no suitable chains" 0
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f scan-tree-dump-times pcom "Predictive commoning failed: no suitable chains" 0