[clang] [compiler-rt] [libcxx] [cmake] Add hexagon-linux cmake cache files (PR #98712)

[Louis Dionne via llvm-commits]

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ldionne wrote:

Ack. Just be aware that so long as there's no CI job, the platform is not officially supported so it may happen that we'll make changes that will make your life harder. We won't do it on purpose, of course, but it could happen because "no CI" == "no visibility into the impact of changes for that configuration".

https://github.com/llvm/llvm-project/pull/98712