From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   ab665f217ac5..5b3ac20fc07e  main       -> origin/main
Switched to branch 'main'
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HEAD is now at 5b3ac20fc07e Revert "[libc++] Don't try to be compatible with libstdc++ in __libcpp_refstring on iOS (#170816)" (#173099)