[patch] Fix linkage computation for derived types in inline functions

[Rafael Espíndola]

> By revised rules you mean the one you proposed, making
>
> InternalLinkage        VisibleNoLinkage       -> NoLinkage
> UniqueExternalLinkage  VisibleNoLinkage       -> NoLinkage
>
> I am OK with it, but I was unable to write any testcase :-(

The attached patch implements your proposed semantics (but keeps the
single bitfield representation, at least for now). Any ideas of a
testcase we could add?

Cheers,
Rafael
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