C++ PATCH: Fix ctor vtables for extreme virtual inheritance

[Nathan Sidwell]

scott snyder wrote:
> With this patch, i'm now getting an ICE in dfs_accumulate_vtbl_inits
> for the appended code (it didn't ICE before the patch went in).
> 
> I've submitted bug c++/3089 in gnats on this.
Scott, thanks for stressing this code.
Jason, I'm looking at this - let's not tangle each other up again :-)

nathan
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