Regressions on trunk at revision 168633 vs revision 168631

[H.J. Lu Intel64]

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

New passes:
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto  execution test