Regressions on trunk at revision 169035 vs revision 168980

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: gcc.dg/guality/nrv-1.c  -O1  line 20 a2.i[0] == 42
FAIL: gcc.dg/guality/nrv-1.c  -O2  line 20 a2.i[0] == 42
FAIL: gcc.dg/guality/nrv-1.c  -Os  line 20 a2.i[0] == 42
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto  execution test