Investigate WASM to speedup ARM emulation where supported

[DirtyHairy]

No description provided.

[MattFromGer]

Maybe adjusting the core to support a build with AssemblyScript could boost the performance without too much effort.
Also check this article.

[DirtyHairy]

An interesting suggestion, thank you. This won't be top priority, but I'll investigate how much work it'd take to build the Web Worker with AS.

That said, this issue aims at the Thumbulator which is compiled from C using emscripten. Using WASM there should be straightforward.

[DirtyHairy]

I have checkout out the AS documentation; I don't think building the core with AS is a realistic option at this time --- among other things, it lacks supports for closures and inheritance.