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31606fddd3
Add Mov2 and Mov3 bytecode instructions that perform 2 or 3 register moves in a single dispatch. A peephole optimization pass during bytecode assembly merges consecutive Mov instructions within each basic block into these combined instructions. When merging, identical Movs are deduplicated (e.g. two identical Movs become a single Mov, not a Mov2). This optimization is implemented in both the C++ and Rust codegen pipelines. The goal is to reduce the per-instruction dispatch overhead, which is significant compared to the actual cost of moving a value. This isn't fancy or elegant, but provides a real speed-up on many workloads. As an example, Kraken/imaging-desaturate.js improves by ~1.07x on my laptop.