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

[Ehud Katz via Phabricator via llvm-commits]

ekatz created this revision.
ekatz added reviewers: tstellar, chandlerc, kuhar, jvesely, dexonsmith.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

In case the then-path of an if-region is empty, then merging with the else-path should be handled with the inverse of the condition (leading to that path).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78881

Files:
  llvm/lib/Transforms/Utils/FlattenCFG.cpp
  llvm/test/Transforms/Util/flattencfg.ll

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