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

[Brian Cain via cfe-commits]

androm3da wrote:

@ldionne I think you'll be satisfied with the changes I've made.  Previously I didn't think your feedback made sense, but I've come around 😉

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