[PATCH] D159075: [WIP][MemCpyOpt] implement flow sensitive stack-move optimization

[Kohei Asano via Phabricator via llvm-commits]

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this is WIP, but you would see expected results we should see pcwalton's case

TODO: write description
TODO: more LLVM_DEBUG
TODO: define enum class and operator overload


https://reviews.llvm.org/D159075

Files:
  llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
  llvm/test/Transforms/MemCpyOpt/stack-move.ll

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