[llvm] [readtapi] Add Extract & Remove architecture functionality (PR #72657)

[Juergen Ributzka via llvm-commits]

https://github.com/ributzka approved this pull request.

LGTM. Could you please add a comment at the beginning of each test and summarize what is being tested?

https://github.com/llvm/llvm-project/pull/72657