Alan Zhao 82c5e302f9 [llvm-ml] Implement support for MASM's extern directive ...

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

Reviewed By: epastor

Submitted By: epastor

Differential Revision: https://reviews.llvm.org/D125273

2022-05-10 14:36:06 -04:00

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