We were (still) not correctly marking the C++ tree structs.  This patch 
fixes that and
1) adds MARK_TS_TYPE_NON_COMMON, because we needed it.
2) sorts the order of marking nodes, so it's a little easier to figure 
where to put new ones.
3) reformats & sorts the common tree_node_structure_for_code to be a 
little clearer in what it's doing.

(these switch statements seem a fine exception to the usual formatting 
rules)

I'll commit to trunk shortly, as the non-c++ bits are sufficiently obvious.

nathan


-- 
Nathan Sidwell