[clang] XFAIL clang/Driver/test/compress.c on AIX (PR #87269)

[Fangrui Song via cfe-commits]

MaskRay wrote:

Can you edit the description to state which command fails on AIX?

These tests all contain `-###` to stop after clangDriver completes. And `clang --target=powerpc-ibm-aix -fintegrated-as -Wa,-compress-debug-sections -c a.c '-###'` seems to work for me.

https://github.com/llvm/llvm-project/pull/87269