Regressions on trunk at revision 202822 vs revision 202818

[H.J. Lu Intel64]

New failures:
FAIL: g++.old-deja/g++.law/virtual2.C -std=c++11 (test for excess errors)
FAIL: gcc.dg/tree-ssa/pr21574.c (test for excess errors)
FAIL: libvtv.cc/virtual_inheritance.cc -O0 -fvtable-verify=std (test for excess errors)

New passes:
FAIL: c-c++-common/asan/global-overflow-1.c  -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: libvtv.cc/xlan-test.cc -O0 -fvtable-verify=std (test for excess errors)