From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   fb20976d11cd..23a13d0b4667  main       -> origin/main
Switched to branch 'main'
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HEAD is now at 23a13d0b4667 [CMake][NFC] Remove dead code add_llvm_external_project(libclc) (#196241)