[llvm] [llvm-objcopy][COFF] Update WinCFGuard section contents after stripping (PR #153322)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

Thanks, the implementation looks mostly straightforward at this point now. A couple issues/questions remain though, plus @jh7370's comments.

https://github.com/llvm/llvm-project/pull/153322