[PATCH] D123834: [PGO] Remove legacy PM passes

[Fangrui Song via Phabricator via llvm-commits]

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Legacy PM was deprecated in 13.0.0 and Clang dropped legacy PM support in
D123609 <https://reviews.llvm.org/D123609>. This change removes legacy PM passes for PGO so that downstream
projects won't be able to use it.
It seems appropriate to start removing such "add-on" features like
instrumentations, before we remove more stuff after 15.x is branched.

I have checked many LLVM users and only ldc[1] uses the legacy PGO pass.

[1]: https://github.com/ldc-developers/ldc/issues/3961


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123834

Files:
  llvm/include/llvm/InitializePasses.h
  llvm/include/llvm/LinkAllPasses.h
  llvm/include/llvm/Transforms/IPO/PassManagerBuilder.h
  llvm/include/llvm/Transforms/Instrumentation.h
  llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
  llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
  llvm/lib/Transforms/Instrumentation/Instrumentation.cpp
  llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
  llvm/lib/Transforms/Instrumentation/PGOMemOPSizeOpt.cpp
  llvm/test/CodeGen/AMDGPU/opt-pipeline.ll

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