Revert "[JITLink][PowerPC] Pre-commit test for D158708. NFC."

This reverts commit 4468103b.

This added testcase is failing on Darwin:
https://green.lab.llvm.org/green/job/clang-stage1-cmake-RA-incremental/37181/testReport/junit/LLVM/ExecutionEngine_JITLink_ppc64/ppc64_rel24_non_zero_addend_test/

More info in: https://reviews.llvm.org/D158708