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

[Brian Cain via cfe-commits]

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androm3da wrote:

IMO landing these cache files are baby steps towards having such a CI job.  I'll look into what it would take, yes.

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