[llvm] big archive recognition by the llvm-symbolizer (PR #150401)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Consider title like `[llvm-symbolizer] Recognize AIX big archive`. There are several archive formats, and to the best of my knowledge "big archive" as a term is AIX specific.

https://github.com/llvm/llvm-project/pull/150401