[PATCH] D128944: [ms] [llvm-ml] Add support for anonymous labels (`@@`, `@B`, `@F`)

[Eric Astor via Phabricator via llvm-commits]

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ml.exe and ml64.exe support the use of anonymous labels, with @B and @F referring to the previous and next anonymous label respectively.

We add similar support to llvm-ml, with the exception that we are unable to emit an error message for an @F expression not followed by a @@ label.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128944

Files:
  llvm/lib/MC/MCParser/MasmParser.cpp
  llvm/test/tools/llvm-ml/anonymous_labels.asm
  llvm/test/tools/llvm-ml/anonymous_labels_errors.asm

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