Regressions on trunk at revision 261618 vs revision 261582

[H.J. Lu]

New failures:
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"

New passes: