[CI] add tests for assigns sort

[yuxiaomao]

Caused by fun.assigns not sorted as expected. Fix in haxe

Failed example:

> p this
([15], Test) : $Closure:0
  $0 = [15] : Array<Int>
  $1 = Test : Test
> p functionvar
Error Unknown identifier functionvar
Called from hld.Eval.evalExpr (hld/Eval.hx line 220)
Called from hld.Eval.eval (hld/Eval.hx line 101)
Called from hld.Debugger.getValue (hld/Debugger.hx line 832)
Called from hld.Main.command (hld/Main.hx line 281)
Called from hld.Main.command (hld/Main.hx line 281)