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This implements `airSplat` for the native WebAssembly backend when the features 'simd128' or 'relaxed-simd' are enabled. The commit supports splat where the value lives in the linear memory segment, as well as on the stack. This saves a lot of instruction cost. When it detects the element type is not 8, 16, 32 or 64 bits, the backend will instead use the same strategy as if the features where disabled.