Fix zero-extension in i64.load32_u.
Fix zero-extension in i64.load32_u.

ddcc/binaryen,ddcc/binaryen,ddcc/binaryen,yurydelendik/binaryen,yurydelendik/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,yurydelendik/binaryen,ddcc/binaryen,ddcc/binaryen,yurydelendik/binaryen,WebAssembly/binaryen,yurydelendik/binaryen,WebAssembly/binaryen,WebAssembly/binaryen