Regressions on trunk at revision 258054 vs revision 258030

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/tree-ssa/gen-vect-25.c scan-tree-dump-times vect "vectorized 2 loops" 1 (found 0 times)
FAIL: gcc.target/i386/vect-unpack-3.c scan-tree-dump vect "LOOP VECTORIZED"
FAIL: libgomp.graphite/force-parallel-8.c scan-tree-dump-times graphite "5 loops carried no dependency" 1 (found 0 times)