[PATCH] D97407: [LoopUnrollAndJam] Avoid repeated instructions for UAJ analysis

[Danilo Carvalho Grael via Phabricator via llvm-commits]

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Avoid visiting repeated instructions for processHeaderPhiOperands as it can cause a scenario of endless loop. Test case is attached and can be ran with `opt -basic-aa -tbaa -loop-unroll-and-jam  -allow-unroll-and-jam -unroll-and-jam-count=4`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97407

Files:
  llvm/lib/Transforms/Utils/LoopUnrollAndJam.cpp
  llvm/test/Transforms/LoopUnrollAndJam/unroll-and-jam-many-instr.ll

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