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

[James Henderson via llvm-commits]

================

----------------
jh7370 wrote:

I'm probably being blind, but I'm struggling to see what impact this is having on the `ExpectedBeforeUpdate` data?

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