Regressions on trunk at revision 171205 vs revision 171192

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/guality/vla-1.c  -O2 -flto  line 17 sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c  -O2 -flto -flto-partition=none  line 17 sizeof (a) == 6

New passes:
FAIL: gcc.dg/guality/sra-1.c  -O2 -flto  line 43 a.j == 14