Regressions on trunk at revision 247722 vs revision 247721

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/tree-ssa/ssa-thread-17.c scan-tree-dump-times vrp1 "Folded into:[^\r\n]*ASSERT_EXPR*[^\r\n]* == 1" 1
FAIL: gcc.dg/tree-ssa/ssa-thread-17.c scan-tree-dump-times vrp1 "Threaded" 1