[mypyc] Optimize away some bool/bit registers #17022
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If a register is always used in a branch immediately after assignment, and it isn't used for anything else, we can replace the assignment with a branch op. This avoids some assignment ops and gotos.
This is not a very interesting optimization in general, but it will help a lot with tagged integer operations once I refactor them to be generated in the lowering pass (in follow-up PRs).