Regression in 2.11.8

A.scala

class A {
  private case class B(x: Int)
  private object B {
    val z = B(0)
  }
  val a = B.z.x
}

/* Compiling under 2.11.7 and running (new A).a results in 0
   Compiling under 2.11.8 and running (new A).a results in SOE:
  at A$B$.<init>(a.scala:4)
  at A.A$$B$lzycompute(a.scala:3)
  at A.A$$B(a.scala:3)
  at A$B$.<init>(a.scala:4)
  at A.A$$B$lzycompute(a.scala:3)
  at A.A$$B(a.scala:3)
  at A$B$.<init>(a.scala:4)