Cleanup stacktraces to not contain intrinsic method calls

[WojciechMazur]

Before:

java.lang.RuntimeException
        at java.lang.StackTrace$.currentStackTrace$$anonfun$1(Throwables.scala:57)
        at java.lang.StackTrace$$$Lambda$3.applyVoid(Throwables.scala:87)
        at scala.runtime.function.JProcedure1.apply(JProcedure.scala:28)
        at scala.scalanative.unsafe.Zone$.apply(Zone.scala:29)
        at java.lang.StackTrace$.currentStackTrace(Throwables.scala:50)
        at java.lang.Throwable.fillInStackTrace(Throwables.scala:146)
        at Test$.main(Test.scala:3)
        at Test.main(Test.scala:3)
        at <none>.main(unknown:2)

After:

java.lang.RuntimeException
        at Test$.main(Test.scala:3)
        at Test.main(Test.scala:3)
        at <none>.main(unknown:2)