Regressions on trunk at revision 211713 vs revision 211693

[i64coreavxi@ecsmtp.ims.intel.com]

New failures:

New passes:
FAIL: g++.dg/abi/layout4.C -std=gnu++11 (test for excess errors)
FAIL: g++.dg/abi/layout4.C -std=gnu++1y (test for excess errors)
FAIL: g++.dg/abi/layout4.C -std=gnu++98 (test for excess errors)