Regressions on trunk at revision 235856 vs revision 235804

[H.J. Lu x32]

New failures:
FAIL: gcc.target/i386/avx512f-vprord-1.c scan-assembler-times vprord[ \\t]+[^{\n]*%zmm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/avx512f-vprord-1.c scan-assembler-times vprord[ \\t]+[^{\n]*%zmm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/avx512f-vprord-1.c scan-assembler-times vprord[ \\t]+[^{\n]*%zmm[0-9]+(?:\n|[ \\t]+#) 1

New passes:
FAIL: gcc.dg/tree-ssa/ssa-thread-14.c scan-tree-dump-times vrp1 "Threaded jump" 8