[PATCH] D113185: Add NoOpLoopNestPass and LOOPNEST_PASS macro

[Whitney Tsang via Phabricator via llvm-commits]

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Having a NoOpLoopNestPass can ensure that only outermost loop is invoked for a LoopNestPass with a lit test.

There are some existing passes that are implemented as LoopNestPass, but they are still using LOOP_PASS macro. 
It would be easier to identify LoopNestPasses with a LOOPNEST_PASS macro.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113185

Files:
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/test/Other/loopnest-pass-ordering.ll
  llvm/test/Other/print-passes.ll

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