Regressions on trunk at revision 168601 vs revision 168599

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto  execution test
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto  execution test
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto -flto-partition=none  execution test