Minor cleanup/prep in DOM

It's a bit weird that free_dom_edge_info leaves a dangling pointer in e->aux.
Not sure what I was thinking.

There's two callers.  One wipes e->aux immediately after the call, the other
attaches a newly created object immediately after the call.  So we can wipe
e->aux within the call and simplify one of the two call sites.

This is preparatory work for a minor optimization where we want to detect
another class of edge equivalences in DOM (until something better is available)
and either attach them an existing edge_info structure or create a new one if
one doesn't currently exist for a given edge.

gcc/
	* tree-ssa-dom.cc (free_dom_edge_info): Clear e->aux too.
	(free_all_edge_infos): Do not clear e->aux here.

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