fix bug in wasm-check: compare ops return i32
fix bug in wasm-check: compare ops return i32

WebAssembly/wabt,WebAssembly/wabt,citisolo/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,citisolo/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,citisolo/wabt,WebAssembly/sexpr-wasm-prototype