The "handlers" on the interpreter stack is sometimes treated as host pointers and sometimes treated as i64 values. It's quite broken for targets where pointers are not 64-bit. This commit makes them host pointers consistently. (at least for 32-bit and 64-bit pointers. We don't support other pointer sizes anyway.) Fixes https://github.com/bytecodealliance/wasm-micro-runtime/issues/3110