llvm dev - Jul 2012 - [LLVMdev] LLVM 3.1 type linking?

I've been writing a compiler that was formerly using LLVM 2.9 as its
backend, and it relied on the fact that LLVM's bitcode linker would unify
identically-named types across modules if all of the declarations but one
defined the type as opaque.  The compiler worked this way to avoid
whole-program compilation.  How can I get back this kind of behavior now
that I've upgraded to LLVM 3.1?

Thanks,
Eli Gottlieb
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