Regressions on trunk at revision 228442 vs revision 228376

[H.J. Lu ia32 Core i7]

New failures:

New passes:
FAIL: gfortran.dg/graphite/block-1.f90   -O   scan-tree-dump-times graphite "number of SCoPs: 1" 1
FAIL: gfortran.dg/graphite/block-2.f   -O   scan-tree-dump-times graphite "number of SCoPs: 2" 1