Enable pending pos tests related to value classes

Each test needs to have its own package because pos_all will try to
compile the whole valueclasses directory at once.

The remaining tests with "extends AnyVal" in tests/pending/pos are
related to separate compilation, except for:
- t6482.scala and t7022.scala which were fixed by
  scala/scala#1468 in scalac and seem to
  trigger a similar bug in FullParameterization
- strip-tvars-for-lubbasetypes.scala which was fixed by
  scala/scala#1758 in scalac

Author: smarter

tests/pending/pos/optmatch.scala renamed to tests/pos/valueclasses/optmatch.scala

@@ -1,11 +1,13 @@
+package optmatch
+
 // final case class NonZeroLong(value: Long) extends AnyVal {
 //   def get: Long = value
 //   def isEmpty: Boolean = get == 0l
 // }
 
 class NonZeroLong(val value: Long) extends AnyVal {
   def get: Long = value
-  def isEmpty: Boolean = get == 0l
+  def isDefined: Boolean = get != 0l
 }
 object NonZeroLong {
   def unapply(value: Long): NonZeroLong = new NonZeroLong(value)

tests/pending/pos/t5667.scala renamed to tests/pos/valueclasses/t5667.scala

@@ -1,3 +1,5 @@
+package t5667
+
 object Main {
   implicit class C(val s: String) extends AnyVal
   implicit class C2(val s: String) extends AnyRef

tests/pending/pos/t5953.scala renamed to tests/pos/valueclasses/t5953.scala

@@ -1,3 +1,5 @@
+package t5953
+
 import scala.collection.{ mutable, immutable, generic, GenTraversableOnce }
 
 package object foo {

tests/pending/pos/t6260a.scala renamed to tests/pos/valueclasses/t6260a.scala

@@ -1,3 +1,5 @@
+package t6260a
+
 final class Option[+A](val value: A) extends AnyVal
 
 // Was: sandbox/test.scala:21: error: bridge generated for member method f: ()Option[A] in class Bar

tests/pending/pos/t8011.scala renamed to tests/pos/valueclasses/t8011.scala

@@ -1,3 +1,5 @@
+package t8011
+
 class ThingOps1(val x: String) extends AnyVal {
   def fn[A]: Any = {
     new X[A] { def foo(a: A) = a }