Clangd segfault investigation

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steps.md

1. touch foo.cpp compile_flags.txt
2. mkfifo clangd_in clangd_out
3. Have three terminal windows open
4. In first do tail -f clangd_out, to stop clangd from blocking.
5. In second do /path/to/clangd <clangd_in 1>clangd_out
6. In third do cat data > clangd_in
7. profit THE HORROR!