[libclc] [libclc] Fix using normalized triple for the directory name (PR #194607)

[Konrad Kleine via cfe-commits]

kwk wrote:

> > IMHO, if this PR could get merged, this would be a step in the right direction. Changing the clspv triple can be done in a separate PR, no?
> 
> Yes, just waiting on review

Are you planning to introduce the README.md changes as well? I think it makes sense.

https://github.com/llvm/llvm-project/pull/194607