[llvm] [XCOFF][OBJECT] get symbol size by calling XCOFF interfaces (PR #67304)

[Chen Zheng via llvm-commits]

chenzheng1030 wrote:

> once @diggerlin is happy and the other PR has landed, please rebase this PR and force push, making sure that the PR description lines up with your final intended commit message, so that I can review that too.

Thanks, I changed to use latest case from https://github.com/llvm/llvm-project/pull/67284 and the pr description is also finalized.


https://github.com/llvm/llvm-project/pull/67304