Regressions on trunk at revision 263308 vs revision 263300

[H.J. Lu (Intel64 Core i7)]

New failures:
FAIL: g++.dg/pr83239.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/pr83239.C  -std=gnu++98 (test for excess errors)

New passes:
FAIL: g++.dg/pr83239.C  -std=gnu++11  scan-tree-dump-not optimized "_ZNSt6vectorIiSaIiEE17_M_default_appendEm"
FAIL: g++.dg/pr83239.C  -std=gnu++14  scan-tree-dump-not optimized "_ZNSt6vectorIiSaIiEE17_M_default_appendEm"