[llvm] [JITLink][AArch32] Unittest for error paths of readAddend and applyFixup functionality (PR #69636)

[Stefan Gränitz via llvm-commits]

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

LGTM, thanks for the initiative to start testing error paths. Looking forward to applying this on a larger scale.

https://github.com/llvm/llvm-project/pull/69636