Adjusted GenScalacticDotty to support //DOTTY-ONLY, // SKIP-DOTTY-START and // SKIP-DOTTY-END.
Adjusted GenScalacticDotty to support //DOTTY-ONLY, // SKIP-DOTTY-START and // SKIP-DOTTY-END.

cheeseng/scalatest,dotty-staging/scalatest,scalatest/scalatest,scalatest/scalatest,cheeseng/scalatest,cheeseng/scalatest,scalatest/scalatest,dotty-staging/scalatest,dotty-staging/scalatest