Regressions on trunk at revision 224114 vs revision 224098

[Intel Automatic Testing System [Intel64 Core AVX2]]

New failures:

New passes:
FAIL: g++.dg/abi/mangle-regparm.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/abi/mangle-regparm.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/abi/mangle-regparm.C  -std=c++98 (test for excess errors)