[PATCH] D123894: [msan] Remove legacy PM pass

[Fangrui Song via Phabricator via llvm-commits]

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Using the legacy PM for the optimization pipeline was deprecated in 13.0.0.
Following recent changes to remove non-core features of the legacy
PM/optimization pipeline, remove MemorySanitizerLegacyPass.

I am going to wait a bit for

- Rust https://internals.rust-lang.org/t/llvms-legacy-pass-manager-passes-for-sanitizers-will-go-away/16473
- SwiftShader https://issuetracker.google.com/issues/229437380


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123894

Files:
  llvm/include/llvm/InitializePasses.h
  llvm/include/llvm/Transforms/Instrumentation/MemorySanitizer.h
  llvm/lib/Transforms/Instrumentation/Instrumentation.cpp
  llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

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