[fuzz] Fix order of operands passed in to wasm-spec-interpreter (#4672)

In #4671, the meta-differential fuzz target was finding errors when
running certain Wasm modules (specifically `shr_s` in that case).
@conrad-watt diagnosed the issue as a missing reversal in the operands
passed to the spec interpreter. This change fixes #4671 and adds an
additional unit test to keep it fixed.

crates/fuzzing/wasm-spec-interpreter/src/with_library.rs

@@ -119,4 +119,15 @@ mod tests {
             ])]
         );
     }
+
+    // See issue https://github.com/bytecodealliance/wasmtime/issues/4671.
+    #[test]
+    fn order_of_params() {
+        let module = wat::parse_file("tests/shr_s.wat").unwrap();
+
+        let parameters = Some(vec![Value::I32(1795123818), Value::I32(-2147483648)]);
+        let results = interpret(&module, parameters.clone()).unwrap();
+
+        assert_eq!(results, vec![Value::I32(1795123818)]);
+    }
 }