Wrote up a five-week rewrite of Rell's compiler IR...

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[Iaroslav Postovalov]

Wrote up a five-week rewrite of Rell's compiler IR: behavior came off the
compiler's nodes, the IR became pure Kotlin data classes under a sealed
interface, and the interpreter is now exhaustive when over it.

There is also a new GraalVM Truffle backend, also solo written.

github.com/CommanderTvis/writing/…/rr-truffle-rewrite