MatchData#end returns invalid offset when called within evalAsync

Stackblitz reproduction: https://stackblitz.com/edit/ruby-wasm-demo-78s71k?file=index.html

MatchData#end returns incorrect match offset when used in async context:

```
vm.eval(/(т)(е)(с)/.match('тест').end(0)) #=> 3
vm.eval(/(т)(е)(с)/.match('тест').end(1)) #=> 1

vm.evalAsync(/(т)(е)(с)/.match('тест').end(0)) #=> 3291
vm.evalAsync(/(т)(е)(с)/.match('тест').end(1)) #=> 3
```