Regressions on trunk at revision 199049 vs revision 199006

[H.J. Lu x32]

New failures:
FAIL: gcc.dg/tree-ssa/reassoc-28.c scan-tree-dump-times reassoc1 "to a different BB" 1
FAIL: gcc.dg/tree-ssa/reassoc-28.c scan-tree-dump-times reassoc1 "within same BB" 2

New passes:
FAIL: gcc.dg/lto/attr-weakref-1 c_lto_attr-weakref-1_0.o-c_lto_attr-weakref-1_2.o link, -O0 -flto -fuse-linker-plugin -fno-fat-lto-objects 
FAIL: gcc.dg/lto/attr-weakref-1 c_lto_attr-weakref-1_0.o-c_lto_attr-weakref-1_2.o link, -O2 -flto -flto-partition=none -fuse-linker-plugin -fno-fat-lto-objects 
FAIL: gcc.dg/lto/attr-weakref-1 c_lto_attr-weakref-1_0.o-c_lto_attr-weakref-1_2.o link, -O2 -flto -fuse-linker-plugin