External Issue: What does CHPL_HOST_COMPILER=clang-included do?

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17584, "BryantLam", "What does CHPL_HOST_COMPILER=clang-included do?", "2021-04-21T23:58:22Z"

Documentation in 1.24 for CHPL_*_COMPILER could be more clear about how CHPL_HOST_COMPILER=clang-included behaves.

This value doesn't make sense to me because clang-included doesn't exist until is built by clang-included.

Actually trying it out seems to have it behave like clang. I think the implementation needs to catch this and throw a build error. How does it actually behave and why?