[PATCH] D96644: [NFC] Refactor LoopInterchange into a loop-nest pass

[Ta-Wei Tu via Phabricator via llvm-commits]

TaWeiTu created this revision.
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This is the preliminary patch of converting `LoopInterchange` pass to a loop-nest pass and has no intended functional change.
Besides replacing `Loop` with `LoopNest`, this patch also removes the parameters `OuterLoopId` in many functions since it always has the value of `InnerLoopId - 1`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96644

Files:
  llvm/include/llvm/Analysis/LoopNestAnalysis.h
  llvm/include/llvm/Transforms/Scalar/LoopInterchange.h
  llvm/lib/Transforms/Scalar/LoopInterchange.cpp
  llvm/test/Transforms/LoopInterchange/interchange-flow-dep-outer.ll
  llvm/test/Transforms/LoopInterchange/interchanged-loop-nest-3.ll
  llvm/test/Transforms/LoopInterchange/not-interchanged-loop-nest-3.ll

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