[llvm] [TailDuplicator] Determine if computed gotos using `blockaddress` (PR #132536)

[Alexander Kornienko via llvm-commits]

https://github.com/alexfh approved this pull request.

I verified that this fixes the problems we've found so far, but I can't say anything about the correctness or other aspects of this approach.

https://github.com/llvm/llvm-project/pull/132536