Regressions on trunk at revision 154650 vs revision 154648

[H.J. Lu ia32]

New failures:

New passes:
FAIL: g++.dg/torture/stackalign/unwind-2.C  -O1  execution test
FAIL: g++.dg/torture/stackalign/unwind-2.C  -O2  execution test
FAIL: g++.dg/torture/stackalign/unwind-2.C  -O2 -flto  execution test
FAIL: g++.dg/torture/stackalign/unwind-2.C  -O2 -fwhopr  execution test