build_nt and build_parse_node

[Joseph S. Myers]

tree.c contains two functions, build_nt and build_parse_node, that are
textually identical apart from the function name.  build_parse_node has a
comment

	/* Similar to `build_nt', except we build
	   on the temp_decl_obstack, regardless.  */

which is obsolete given gc.  Should one of these functions die and have
its callers changed to call the other?  Which one should die, if so?

-- 
Joseph S. Myers
jsm28@cam.ac.uk