[PATCH] D78881: [FlattenCFG] Fix `MergeIfRegion` in case then-path is empty

[Sameer Sahasrabuddhe via Phabricator via llvm-commits]

sameerds accepted this revision.
sameerds added a comment.

I am NOT familiar with this transformation. But I believe that the patch is well-formed, and I was able to follow the logic. The tests also demonstrate that it works as intended. LGTM.


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