Regressions on trunk at revision 168978 vs revision 168952

[H.J. Lu Intel64-bootstrap-lto]

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 -flto-partition=none  execution test