[test] Add assertion that constructor is a wrapper (#90)

Wasm functions configured as constructors by configureAll are wrapped
(as opposed to mutated in-place) to allow them to be called with `new`.
Add an assertion that the constructor that appears on the JS side is not
pointer-identical with the unwrapped Wasm function.

Author: tlively

test/js-api/custom-descriptors/configure-all.any.js

@@ -438,6 +438,7 @@ test(() => {
 
   const MyStruct = constructors.MyStruct;
   assert_equals(proto.constructor, MyStruct);
+  assert_not_equals(MyStruct, makeStructWithProto);
 
   assert_true(Object.hasOwn(MyStruct, "prototype"));
   assert_true(Object.hasOwn(MyStruct, "method"));