Regressions on native/master at commit r11-4004 vs commit r11-3962 on Linux/x86_64

[H. J. Lu]

New failures:
FAIL: gcc.dg/vect/slp-11b.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 0
FAIL: gcc.dg/vect/slp-11b.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 0
FAIL: gcc.dg/vect/slp-11b.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 0
FAIL: gcc.dg/vect/slp-11b.c scan-tree-dump-times vect "vectorizing stmts using SLP" 0
FAIL: gcc.dg/vect/slp-11b.c scan-tree-dump-times vect "vectorizing stmts using SLP" 0
FAIL: gcc.dg/vect/slp-11b.c scan-tree-dump-times vect "vectorizing stmts using SLP" 0
FAIL: gcc.dg/vect/slp-21.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-21.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-21.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-21.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-21.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-21.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2

New passes:
FAIL: gcc.dg/tree-ssa/modref-4.c scan-tree-dump modref1 "return 0"
FAIL: gcc.dg/tree-ssa/modref-4.c scan-tree-dump modref1 "return 0"
FAIL: gcc.dg/tree-ssa/modref-4.c scan-tree-dump modref1 "return 0"