Compile-time improvement: 2/n.
* cp-tree.h (struct cxx_binding): New datatype;
(struct lang_identifier): Use it.
(LOCAL_BINDING_P): Adjust definition.
(INHERITED_VALUE_BINDING_P): Likewise.
(BINDING_SCOPE): Likewise.
(BINDING_HAS_LEVEL_P): Likewise.
(BINDING_VALUE): Likewise.
(BINDING_TYPE): Likewise.
(IDENTIFIER_VALUE): Likewise.
(struct tree_binding): Remove.
(TS_CP_BINDING): Likewise.
((union lang_tree_node): Remove field "binding".
(cxx_binding_clear): New macro.
(binding_for_name): Adjust return type.
(qualified_lookup_using_namespace): Adjust prototype.
(lookup_using_namespace): Adjust prototype.
(cxx_scope_find_binding_for_name): Declare.
* cp-tree.def: Remove CPLUS_BINDING definition.
* parse.y (parse_scoped_id): Don't type-abuse of 'id'. Allocate
temporary cxx_binding on stack. Simplify.
* decl.c (push_binding): Adjust local variable type.
(add_binding): Likewise.
(push_class_binding): Likewise.
(pop_binding): Likewise.
(poplevel): Likewise.
(poplevel_class): Likewise.
(free_bindings): Adjust type.
(find_binding): Adjust return type, add a third parameter. Remove
non-useful assertion now that we use static typing.
(cxx_scope_find_binding_for_name): New function.
(binding_for_name): Use it. Adjust local variable type. Simplify.
(namespace_binding): Simplify.
(set_namespace_binding): Likewise.
(set_identifier_type_value_with_scope): Adjust local variable type.
(lookup_tag): Don't type-abuse of local variable 'old'.
(lookup_namespace_name): Likewise. Allocate binding on stack.
(select_decl): Adjust prototype.
(unqualified_namespace_lookup): Allocate binding on stack.
Don't type-abuse of local variable 'val'.
(lookup_name_real): Likewise.
(maybe_inject_for_scope_var): Adjust local variable type.
(cp_tree_node_structure): Remove CPLUS_BINDING case label.
(namespace_binding): Adjust logic, simplify.
(BINDING_LEVEL): Adjust definition.
(push_class_level_binding): Adjust local variable type.
(struct cxx_saved_binding): Adjust field 'binding' type.
* decl2.c (ambiguous_decl): Adjust prototype.
(lookup_using_namespace): Adjust local variable type.
(qualified_lookup_using_namespace): Catch type error and correct
ensueing logic error.
(do_nonmember_using_decl): Adjust local variable type. Allocate
temporary cxx_binding on stack.
(do_toplevel_using_decl): Adjust local variable type.
* ptree.c (cxx_print_cxx_binding): New function.
(cxx_print_identifier): Use it.
(cxx_print_xnode): Delete CPLUS_BINDING case label.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@64405 138bc75d-0d04-0410-961f-82ee72b054a4