Drop reference to NotJavaPrivate in access checks.

Verified that all tests still run. This is a first step, so that
we can later on eliminate NotJavaPrivate altogether.

Author: odersky

src/dotty/tools/dotc/core/SymDenotations.scala

@@ -958,7 +958,7 @@ object SymDenotations {
      */
     final def accessBoundary(base: Symbol)(implicit ctx: Context): Symbol = {
       val fs = flags
-      if (fs is (Private, butNot = NotJavaPrivate)) owner
+      if (fs is Private) owner
       else if (fs is StaticProtected) defn.RootClass
       else if (privateWithin.exists && !ctx.phase.erasedTypes) privateWithin
       else if (fs is Protected) base