David Majnemer a34c14ca02 [Verifier] Diagnose when unwinding out of cycles of blocks
Generally speaking, this can only happen with unreachable code.
However, neglecting to check for this condition would lead us to loop
forever.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262284 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-01 01:19:05 +00:00
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