[Wasm GC] Fix the type of ref.as_func, which should be non-nullable (#3821)
[Wasm GC] Fix the type of ref.as_func, which should be non-nullable (#3821)


WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen