* src/abg-ir.h (location): Make the default ctor public.
(class decl): Declare data member and proper constructors. Make the
context be a shared_ptr. Add a kind data member to avoid RTTI for
now.
(class scope_decl): Added protected constructor to handle the kind data
member.
(class type_base): Add data members proper and clean the iface up.
(class type_decl, scope_type_decl, namespace_decl): Iron out
constructors.
* src/abg-ir.cc (class location): Fix style.
(class decl, scope_decl, type_base, type_decl, scope_type_decl)
(namespace_decl): Define these types.
