[C++ PATCH] Simplify overloads
https://gcc.gnu.org/ml/gcc-patches/2018-10/msg02026.html
gcc/cp/
* cp-tree.h (OVL_DEDUP_P): New.
* name-lookup.c (name_lookup::add_overload): Check OVL_DEDUP_P.
(get_class_binding_direct): Likwise.
* tree.c (ovl_make): Propagate OVL_DEDUP_P.
(ovl_copy): Copy it.
(ovl_insert): Do not keep using-decls ordered.
(lookup_maybe_add): Adjust comment.
gcc/testsuite/
* g++.dg/lookup/using60.C: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@265679 138bc75d-0d04-0410-961f-82ee72b054a4