[llvm] [SystemZ][z/OS] TXT records in the GOFF reader (PR #87648)

[Yusra Syeda via llvm-commits]

ysyeda wrote:

> Is it practical to split this into two commits for review purposes, with the original PR's version followed by just the changes needed to fix the issue you ran into? I think it's going to be a pain to review the difference otherwise.

Sure, I split it into 2 commits.

https://github.com/llvm/llvm-project/pull/87648