Regressions on trunk at revision 258052 vs revision 258031

[H.J. Lu ia32 Core i7]

New failures:
FAIL: gcc.dg/tree-ssa/pr84512.c scan-tree-dump optimized "return 285;"
FAIL: gcc.dg/vect/costmodel/i386/costmodel-fast-math-vect-pr29925.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.dg/vect/costmodel/i386/costmodel-vect-reduc-1char.c scan-tree-dump-times vect "vectorization not profitable" 0 (found 1 times)
FAIL: gfortran.dg/vect/fast-math-mgrid-resid.f   -O   scan-tree-dump pcom "vectp_u.*__lsm.* = PHI <.*vectp_u.*__lsm"

New passes:
FAIL: gcc.dg/tree-ssa/gen-vect-11a.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.dg/tree-ssa/gen-vect-2.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.dg/vect/costmodel/i386/costmodel-vect-31.c scan-tree-dump-times vect "vectorized 4 loops" 1 (found 0 times)
FAIL: gcc.dg/vect/costmodel/i386/costmodel-vect-reduc-1char.c scan-tree-dump-times vect "vectorization not profitable" 0 (found 3 times)
FAIL: gcc.target/i386/avx2-vect-shift.c scan-tree-dump vect "LOOP VECTORIZED"
FAIL: gcc.target/i386/pr42542-4a.c scan-assembler pcmpgtq
FAIL: gcc.target/i386/pr42542-5a.c scan-assembler pcmpgtq
FAIL: gcc.target/i386/pr60451.c scan-assembler packuswb|vpunpck
FAIL: gcc.target/i386/rotate-3.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.target/i386/rotate-4.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.target/i386/vect-abs-s16.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.target/i386/vect-abs-s32.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.target/i386/vect-abs-s8.c scan-tree-dump-times vect "vectorized 1 loops" 1 (found 0 times)
FAIL: gcc.target/i386/vect-pr67800.c scan-tree-dump vect "vectorized 1 loops"
FAIL: libgomp.graphite/force-parallel-8.c scan-tree-dump-times graphite "5 loops carried no dependency" 1 (found 0 times)