Regressions on trunk at revision 168642 vs revision 168634

[H.J. Lu ia32]

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

New passes:
FAIL: g++.dg/torture/stackalign/unwind-0.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-0.C  -O2 -flto -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-1.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-1.C  -O2 -flto -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-2.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-2.C  -O2 -flto -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-3.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-3.C  -O2 -flto -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-4.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-4.C  -O2 -flto -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-5.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-5.C  -O2 -flto -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-6.C  -O2 -flto  (test for excess errors)
FAIL: g++.dg/torture/stackalign/unwind-6.C  -O2 -flto -flto-partition=none  (test for excess errors)