[llvm-branch-commits] [llvm] [CMake] Prune dead and unnecessary try_compiles from config.h (PR #223600)

[Reid Kleckner via llvm-branch-commits]

rnk wrote:

Blech, I set the base branch to https://github.com/llvm/llvm-project/tree/users/rnk/factor-lit-subdir-deps , so this merge didn't land on main.

https://github.com/llvm/llvm-project/pull/223600