[compiler-rt] [compiler-rt][Profile] Temporarily Disable Test on AIX (PR #166637)

[Mingming Liu via llvm-commits]

mingmingl-llvm wrote:

> Once the internal shell work lands, we can just remove the `UNSUPPORTED` line because the internal shell natively supports `env -u`. I would expect this to be reenabled in the next week or two.

thanks! If I understand correctly, this change is needed to unblock the internal shell landing. So an intermediate change LGTM.

Added @w2yehia in the reviewer list for visibility of this change. 

https://github.com/llvm/llvm-project/pull/166637