c++/5857: C++ duplicate_decls shouldn't use common_type

[jason@gcc.gnu.org]

Synopsis: C++ duplicate_decls shouldn't use common_type

Responsible-Changed-From-To: unassigned->jason
Responsible-Changed-By: jason
Responsible-Changed-When: Fri Mar 15 11:20:51 2002
Responsible-Changed-Why:
    x
State-Changed-From-To: open->closed
State-Changed-By: jason
State-Changed-When: Fri Mar 15 11:20:51 2002
State-Changed-Why:
    fixed

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5857