Regressions on trunk at revision 172963 vs revision 172945

[H.J. Lu Intel64 Core 2/i7]

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/tree-prof/val-prof-2.c scan-tree-dump optimized "n_[0-9]* \+ 0xffff"
FAIL: gcc.dg/tree-prof/val-prof-2.c scan-tree-dump optimized "n_[0-9]* \+ 0xffff"