Regressions on trunk at revision 176032 vs revision 176025

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/graphite/interchange-14.c scan-tree-dump-times graphite "will be interchanged" 1
FAIL: gcc.dg/graphite/interchange-15.c scan-tree-dump-times graphite "will be interchanged" 1
FAIL: gcc.dg/graphite/interchange-mvt.c scan-tree-dump-times graphite "will be interchanged" 1