[llvm] [LoopUnroll] Bound automatic full-unroll cloning work (PR #211683)

[Justin Fargnoli via llvm-commits]

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+; RUN: opt < %s -passes='default<O2>' -disable-output
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justinfargnoli wrote:

Will it cause a timeout in the CI? If not, I'm not sure it makes sense to add a test that passes without the fix, even if it takes a long time to pass. 

https://github.com/llvm/llvm-project/pull/211683