skwasm: allocating memory until we crash!

See https://vote-dart.web.app/

```
Flutter 3.20.0-10.0.pre.58 • channel master • git@github.com:flutter/flutter.git
Framework • revision 718c81704f (6 hours ago) • 2024-02-20 13:07:59 -0500
Engine • revision e16a260265
Tools • Dart 3.4.0 (build 3.4.0-157.0.dev) • DevTools 2.33.0-dev.6
```