patch for pr9067

[Chris Moller]

Tom

I just sent $subject to gdb-patches.  Turns out it was simultaneously 
more complex and simpler than we both thought:  You can't just blindly 
inhibit multiple printings of static members.  Sometimes it's 
legitimate, like when they legitimately appear multiple times, possibly 
on different paths through the tree.  The simple side is that after I'd 
finished writing a tree-path-aware fix for the bug, while I was testing 
it, I noticed that someone had already stuck in an attempted fix, using 
obstacks, but had screwed up their use.  Not that I'm a big fan of 
obstacks, but on the least-tinkering-possible principle, I scrapped my 
new stuff and fixed the obstacks.

Chris