[libc-commits] [libc] [libc] Remove common_libc_tuners.cmake and move options into config.json. (PR #66226)

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https://github.com/michaelrj-google approved this pull request.

This patch looks fine, but we should look into defining a more general mechanism for converting options in `config.json` to compile flags. Perhaps set compile flags for functions in a specific folder/header?

https://github.com/llvm/llvm-project/pull/66226