Ruby yjit is switching to Rust!

In December 2021, we opened an issue to solicit feedback regarding the porting of the YJIT codebase from C99 to Rust. There were some reservations, but this project was given the go ahead by Ruby core developers and Matz. Since then, we have successfully completed the port of YJIT to Rust. We are opening this pull request to upstream Rust YJIT, effectively replacing the C version of YJIT.

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Wow, they were quick! And it looks like the best decision.

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