remove legacy bincompat stuff in Predef.scala, Stream.scala

it was only there to preserve binary compatibility within
the 2.11.x series

includes updated partest, since the old partest ran afoul
of the Stream change

src/library/scala/Predef.scala

@@ -269,13 +269,6 @@ object Predef extends LowPriorityImplicits with DeprecatedPredef {
     @inline def formatted(fmtstr: String): String = fmtstr format self
   }
 
-  // TODO: remove, only needed for binary compatibility of 2.11.0-RC1 with 2.11.0-M8
-  // note that `private[scala]` becomes `public` in bytecode
-  private[scala] final class StringAdd[A](private val self: A) extends AnyVal {
-    def +(other: String): String = String.valueOf(self) + other
-  }
-  private[scala] def StringAdd(x: Any): Any = new StringAdd(x)
-
   // SI-8229 retaining the pre 2.11 name for source compatibility in shadowing this implicit
   implicit final class any2stringadd[A](private val self: A) extends AnyVal {
     def +(other: String): String = String.valueOf(self) + other

src/library/scala/collection/immutable/Stream.scala

@@ -509,21 +509,6 @@ self =>
     else Stream.Empty
   }
 
-  /** Returns all the elements of this `Stream` that satisfy the predicate `p`
-   * in a new `Stream` - i.e., it is still a lazy data structure. The order of
-   * the elements is preserved
-   *
-   *  @param p the predicate used to filter the stream.
-   *  @return the elements of this stream satisfying `p`.
-   *
-   * @example {{{
-   * $naturalsEx
-   * naturalsFrom(1)  10 } filter { _ % 5 == 0 } take 10 mkString(", ")
-   * // produces
-   * }}}
-   */
-  override def filter(p: A => Boolean): Stream[A] = filterImpl(p, isFlipped = false) // This override is only left in 2.11 because of binary compatibility, see PR #3925
-
   /** A FilterMonadic which allows GC of the head of stream during processing */
   @noinline // Workaround SI-9137, see https://github.com/scala/scala/pull/4284#issuecomment-73180791
   override final def withFilter(p: A => Boolean): FilterMonadic[A, Stream[A]] = new Stream.StreamWithFilter(this, p)

versions.properties

@@ -30,7 +30,7 @@ jline.version=2.12.1
 scala-asm.version=5.0.4-scala-2
 
 # external modules, used internally (not shipped)
-partest.version.number=1.0.7
+partest.version.number=1.0.9
 scalacheck.version.number=1.11.6
 
 # TODO: modularize the compiler