* Makefile.in (CXX_TREE_H): Add dependency on HTAB_H.
	(pt.o): Remove dependency on HTAB_H.
	* cp-tree.h: Include hashtab.h.
	(walk_tree): Change prototype.
	(walk_tree_without_duplicates): New function.
	* decl.c (check_default_argument): Use it.
	* optimize.c (remap_decl): Adjust calls to walk_tree.
	(copy_body): Likewise.
	(expand_calls_inline): Likewise.
	(calls_setjmp_p): Use walk_tree_without_duplicates.
	* pt.c: Don't include hashtab.h.
	(for_each_template_parm): Use walk_tree_without_duplicates.
	* semantics.c (finish-stmt_tree): Likewise.
	(expand_body): Likewise.
	* tree.c (walk_tree): Add additional parameter.
	(walk_tree_without_duplicates): New function.
	(count_trees): Use it.
	(verify_stmt_tree): Adjust call to walk_tree.
	(find_tree): Use walk_tree_without_duplicates.
	(no_linkage_check): Likewise.
	(break_out_target_exprs): Adjust call to walk_tree.
	(cp_unsave): Likewise.

From-SVN: r36155