[PATCH] D96650: [NFC] Replace OuterLoopId with InnerLoopId - 1

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

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This is a split patch of D96644 <https://reviews.llvm.org/D96644>.

Since `OuterLoopId` always have the value of `InnerLoopId - 1`, remove it from the argument lists in `LoopInterchange` utility functions.
Also, fix inconsistent spelling of `OuterLoopId` and `Inner Loop Id` in debug log.
The main reason for this refactor is to help passing `ArrayRef` to function `processLoop()` (remove the need to swap elements in loop list).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96650

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

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