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In the `ModuleEnvironment::declare_signature` callback, also pass the original Wasm function signature, so that consumers may associate this information with each compiled function. This is often necessary because while each Wasm signature gets compiled down into a single native signature, multiple Wasm signatures might compile down into the same native signature, and in these cases the original Wasm signature is required for dynamic type checking of calls.
This is the wasmtime-environ crate, which contains the implementations
of the ModuleEnvironment and FuncEnvironment traits from
cranelift-wasm. They effectively
implement an ABI for basic wasm compilation that defines how linear memories
are allocated, how indirect calls work, and other details. They can be used
for JITing, native object files, or other purposes.