[PATCH] D125273: [llvm-ml] Imlement support for MASM's extern directive

[Alan Zhao via Phabricator via llvm-commits]

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The EXTERN keyword defines external symbols in MASM.

Credit goes to epastor@ for implementing most of the logic; I (ayzhao@)
added some bugfixes and tests.

[0]: https://docs.microsoft.com/en-us/cpp/assembler/masm/extern-masm?view=msvc-170


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125273

Files:
  llvm/lib/MC/MCParser/MasmParser.cpp
  llvm/test/tools/llvm-ml/extern.asm
  llvm/test/tools/llvm-ml/indirect_branch.asm

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