Regressions on trunk at revision 254013 vs revision 254010

[H.J. Lu ia32 Core i7]

New failures:
FAIL: gcc.target/i386/pr61403.c scan-assembler blend
FAIL: g++.dg/vect/slp-pr56812.cc  -std=c++11  scan-tree-dump-times slp1 "basic block vectorized" 1 (found 0 times)
FAIL: g++.dg/vect/slp-pr56812.cc  -std=c++14  scan-tree-dump-times slp1 "basic block vectorized" 1 (found 0 times)
FAIL: g++.dg/vect/slp-pr56812.cc  -std=c++98  scan-tree-dump-times slp1 "basic block vectorized" 1 (found 0 times)

New passes: