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Whenever we effectively take the address of a basic block we need to manually update that basic block to reflect that fact or later passes such as tail duplication and tail merging can break the invariants of the code. =/ Sadly, there doesn't appear to be any good way of automating this or even writing a reasonable assert to catch it early. The change seems trivially and obviously correct, but sadly the only really good test case I have is 1000s of basic blocks. I've tried directly writing a test case that happens to make tail duplication do something that crashes later on, but this appears to require an *amazingly* complex set of conditions that I've not yet reproduced. The change is technically covered by the tests because we mark the blocks as having their address taken, but that doesn't really count as properly testing the functionality. llvm-svn: 348374
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