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This removes the built-in Wasm code generator in favor of
wit-dylib, which is designed to be reused by interpreters for various languages. It avoids redundant effort and leaves us with less code to maintain overall.This isn't particularly optimized, yet. Given how
wit-dylib[-ffi]works, we have to acquire and release the CPython GIL a lot more frequently (e.g. for every parameter and result of every import and export call). I haven't measured the overhead in practice, so I don't know if it's significant; if it is, we can make changes towit-dylibto reduce the overhead. Also,wit-dylibcurrently embeds a data section with a lot of metadata that we don't use, so we could slim that down if needed.Otherwise, this should not affect the developer experience in any noticeable way.