[llvm] [ObjectYAML][NFC] Finalize COFF symbol table offset in writeCOFF (PR #212671)

[James Henderson via llvm-commits]

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jh7370 wrote:

As a general rule, I wouldn't expect to see tests for assertions. That being said, I have no idea what the LLVM standard is.

https://github.com/llvm/llvm-project/pull/212671