Regressions on trunk at revision 208912 vs revision 208898

[H.J. Lu x32]

New failures:

New passes:
FAIL: g++.dg/abi/thunk6.C -std=c++11  scan-assembler _ZTv0_n32_N1CD1Ev
FAIL: g++.dg/abi/thunk6.C -std=c++1y  scan-assembler _ZTv0_n32_N1CD1Ev
FAIL: g++.dg/abi/thunk6.C -std=c++98  scan-assembler _ZTv0_n32_N1CD1Ev