You can still do d8 --trace-turbo \ --trace-deopt \ --code-comments \

You can still do d8 --trace-turbo \ --trace-deopt \ --code-comments \ --redirect-code-traces \ --redirect-code-traces-to=code.asm \ --print-opt-code \ your-file.js and load resulting turbo.cfg and code.asm into IRHydra. However most of the important features (like source and deopt-to-ir mapping) are broken. I used to repair things in my free time - but I don't think I want to do it anymore.