Regressions on trunk at revision 175863 vs revision 175849

[H.J. Lu Intel64 Core 2/i7]

New failures:
FAIL: libgomp.graphite/force-parallel-1.c scan-tree-dump-times graphite "1 loops carried no dependency" 2
FAIL: libgomp.graphite/force-parallel-1.c scan-tree-dump-times graphite "1 loops carried no dependency" 2
FAIL: libgomp.graphite/force-parallel-1.c scan-tree-dump-times optimized "loopfn" 5

New passes:
WARNING: program timed out.