Add test that exercises a cycle reference error

Author: allanrenucci

tests/pos/seqtype-cycle/Test1.scala

@@ -0,0 +1,3 @@
+class Test {
+  def bar = Array(1) // call to Array(_: Repeated)
+}

tests/pos/seqtype-cycle/Test2.scala

@@ -0,0 +1,5 @@
+package object scala {
+  type Throwable = java.lang.Throwable // needed for some reasons
+
+  type Seq[+A] = scala.Seq[A]
+}

tests/pos/seqtype-cycle/Test3.scala

@@ -0,0 +1,5 @@
+package scala
+
+trait Seq[@specialized(1, 2) A]
+
+class specialized(types: Int*) extends scala.annotation.StaticAnnotation