[PATCH] D133312: [Assignment Tracking][17/*] Account for assignment tracking in memcpyopt

[Orlando Cazalet-Hyams via Phabricator via llvm-commits]

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A simple one, just maintained and propagate `DIAssignID` attachments.


https://reviews.llvm.org/D133312

Files:
  llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
  llvm/test/DebugInfo/Generic/assignment-tracking/memcpyopt/merge-stores.ll

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