* tree.h (struct tree_decl_map): New type.
	(tree_decl_map_eq, tree_decl_map_marked_p): Define.
	(tree_decl_map_hash): New prototype.
	(debug_expr_for_decl, value_expr_for_decl): Change into
	tree_decl_map hashtab from tree_map.
	(init_ttree): Adjust initialization.
	(tree_decl_map_hash): New function.
	(decl_debug_expr_lookup, decl_debug_expr_insert,
	decl_value_expr_lookup, decl_value_expr_insert): Adjust.
cp/
	* cp-objcp-common.c (shadowed_var_for_decl): Change into
	tree_decl_map hashtab from tree_map.
	(decl_shadowed_for_var_lookup, decl_shadowed_for_var_insert): Adjust.
	(init_shadowed_var_for_decl): Adjust initialization.

From-SVN: r160185