[clang] XFAIL clang/test/CodeGen/distributed-thin-lto/pass-plugin.ll (PR #186425)

[Hubert Tong via cfe-commits]

================
@@ -1,4 +1,7 @@
 ; REQUIRES: x86-registered-target, plugins, llvm-examples
+; There is an issue with export symbols on AIX that is currently
+; causing this test case to fail. XFAIL for now.
+; XFAIL: target={{.*}}-aix{{.*}}
----------------
hubert-reinterpretcast wrote:

@lei137, this is not a target-based failure but a host-based failure.

```suggestion
; XFAIL: system-aix
```

https://github.com/llvm/llvm-project/pull/186425