Regressions on trunk at revision 196519 vs revision 196513

[H.J. Lu x32]

New failures:
FAIL: gcc.dg/guality/vla-2.c  -O2 -flto -fno-use-linker-plugin -flto-partition=none  line 25 sizeof (a) == 6 * sizeof (int)

New passes:
FAIL: gcc.dg/pr31490.c (test for excess errors)