Regressions on trunk at revision 272127 vs revision 272121

[H.J. Lu (x32)]

New failures:

New passes:
FAIL: g++.dg/cpp1y/feat-cxx14.C   (test for excess errors)
FAIL: g++.dg/cpp1z/feat-cxx1z.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/cpp1z/pr85569.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp2a/feat-cxx2a.C   (test for excess errors)
FAIL: g++.dg/tree-ssa/pr69336.C   (test for excess errors)
FAIL: g++.dg/tree-ssa/pr80293.C   (test for excess errors)