[libclc] Wyles/update libclctests (PR #228681)

[Wenju He via cfe-commits]

wenju-he wrote:

> This was found by #226088. I suspect nothing had run the build on CI for a while as it only triggers now and then, so when clang updated these tests never ran and were never updated.

Currently libclc is built and its test is run only if there is change to libclc or .ci files. So it is not built by default CI.

> I am looking into how we can improve this. I have a few ideas ill bring up at a infra meeting.

Thanks.

https://github.com/llvm/llvm-project/pull/228681