Sway Intermediate Representation

This crate is a work-in-progress library for providing an SSA style IR for the Sway middle end.

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It is modelled after LLVM to a degree, and is designed to simplify the optimization phase of the compiler pipeline.

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It is currently lacking several features and documentation, not to mention optimization passes, but is already capable of being targeted by Sway for codegen and passes the test suite.