Add tests and cleanup overwrites.

Author: nicolasstucki

tests/link-dce-stdlib-fail-run/stdlib-link-vector-1.check renamed to tests/link-dce-failing/link-dynamicVariable.check

@@ -0,0 +1,20 @@
+import scala.annotation.internal
+
+import java.lang.InheritableThreadLocal
+
+object Test {
+  @internal.link.CallGraphBounds(reachableClasses = 24, classesWithReachableMethods = 9, reachableMethods = 13)
+  def main(args: Array[String]): Unit = {
+    val a = new DynamicVariable2(42)
+    System.out.println(a.value)
+  }
+}
+
+
+class DynamicVariable2[T](init: T) {
+  private val tl = new InheritableThreadLocal[T] {
+    override def initialValue = init.asInstanceOf[T with AnyRef]
+  }
+
+  def value: T = tl.get.asInstanceOf[T]
+}