Regressions on native/master at commit r15-3379 vs commit r15-3361 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r15-3379 vs commit r15-3361 on Linux/x86_64
New failures:
FAIL: gcc.dg/vect/slp-11a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-11a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-11a.c scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-11a.c scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-12a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-12a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-12a.c scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-12a.c scan-tree-dump-times vect "vectorizing stmts using SLP" 1

New passes:
FAIL: gcc.dg/vect/slp-54.c -flto -ffat-lto-objects  scan-tree-dump vect "vectorizing stmts using SLP"
FAIL: gcc.dg/vect/slp-54.c scan-tree-dump vect "vectorizing stmts using SLP"