Regressions on trunk at revision 168160 vs revision 168159

[H.J. Lu Intel64-profiled]

New failures:
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/guality/vla-2.c  -O2 -flto  line 25 sizeof (a) == 6 * sizeof (int)

New passes:
FAIL: gcc.dg/guality/vla-2.c  -Os  line 25 sizeof (a) == 6 * sizeof (int)