[browser] JSExport in lazy loaded assembly

1. Add JSExport to a class library
2. Mark that library with `<BlazorWebAssemblyLazyLoad Include="ClassLibrary" />`
3. Load the assembly and get exports

```js
await INTERNAL.loadLazyAssembly("ClassLibrary");
await getAssemblyExports("ClassLibrary");
```

Throws `RuntimeError: memory access out of bounds`