[compiler-rt] [compiler-rt] Fix test ifdefs and XFAILs (PR #160687)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

> It breaks https://lab.llvm.org/buildbot/#/builders/66/builds/19787

Hmm, right. So this is essentially https://github.com/llvm/llvm-project/commit/e9e166e54354330c474457711a8e7a7ca2efd731 which enabled these tests to run in these configurations (where they didn't use to run before), where they now show up as broken.

I guess the best first step is to revert both this and e9e166e54354330c474457711a8e7a7ca2efd731, and then @ahatanak can look into what's needed to make this configuration not break, if they would be relanded.

https://github.com/llvm/llvm-project/pull/160687