Regressions on trunk at revision 253710 vs revision 253704

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gfortran.dg/graphite/interchange-3.f90   -O   scan-tree-dump graphite "tiled"
FAIL: gfortran.dg/graphite/pr68279.f90   -O  (internal compiler error)
FAIL: gfortran.dg/graphite/pr68279.f90   -O  (test for excess errors)