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Note how, according to the spec (see https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md#left-shift-by-scalar), the shift count is computed modulo the lane width. E.g., a shift count of 17 on an i16x8 should not result in all zeroes as it does with Cranelift's `ishl` and x86's `PSSLW`--it should shift once to the left.
This crate performs the translation from a wasm module in binary format to the in-memory form of the Cranelift IR.
If you're looking for a complete WebAssembly implementation that uses this library, see Wasmtime.