Regressions on trunk at revision 233678 vs revision 233672

[H.J. Lu x32]

New failures:

New passes:
FAIL: gcc.dg/builtins-68.c  (test for errors, line 79)
FAIL: gcc.dg/builtins-68.c (test for excess errors)
FAIL: g++.dg/ext/builtin_alloca.C  -std=c++11  (test for errors, line 125)
FAIL: g++.dg/ext/builtin_alloca.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/ext/builtin_alloca.C  -std=c++14  (test for errors, line 125)
FAIL: g++.dg/ext/builtin_alloca.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/ext/builtin_alloca.C  -std=c++98  (test for errors, line 125)
FAIL: g++.dg/ext/builtin_alloca.C  -std=c++98 (test for excess errors)