fix reborrowing of tagged ZST references #1725
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RalfJung
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@SkiFire13 pointed out that Miri fails to detect illegal use of empty slices. This PR fixes that. In so doing, it uncovers a flaw of Stacked Borrows: it is incompatible with how the formatting machinery uses
extern type, so for now we skip reborrowing when we cannot determine the exact size of the pointee.