Drop annotations from trait static super accessor

Based on review suggestion by retronym.

See also scala/scala-dev#213

Author: adriaanm

src/compiler/scala/tools/nsc/backend/jvm/BCodeSkelBuilder.scala

@@ -494,7 +494,7 @@ abstract class BCodeSkelBuilder extends BCodeHelpers {
               genDefDef(statified)
             } else {
               val forwarderDefDef = {
-                val dd1 = global.gen.mkStatic(deriveDefDef(dd)(_ => EmptyTree), traitSuperAccessorName(sym), _.cloneSymbol)
+                val dd1 = global.gen.mkStatic(deriveDefDef(dd)(_ => EmptyTree), traitSuperAccessorName(sym), _.cloneSymbol.withoutAnnotations)
                 dd1.symbol.setFlag(Flags.ARTIFACT).resetFlag(Flags.OVERRIDE)
                 val selfParam :: realParams = dd1.vparamss.head.map(_.symbol)
                 deriveDefDef(dd1)(_ =>

test/files/run/junitForwarders/C_1.scala

@@ -10,6 +10,6 @@ object Test extends App {
     assert(s == e, s"found: $s\nexpected: $e")
   }
   check(classOf[C], "foo - @org.junit.Test()")
-  // TODO scala-dev#213: should `foo$` really carry the @Test annotation?
-  check(classOf[T], "$init$ - ;foo - @org.junit.Test();foo$ - @org.junit.Test()")
+  // scala/scala-dev#213, scala/scala#5570: `foo$` should not have the @Test annotation
+  check(classOf[T], "$init$ - ;foo - @org.junit.Test();foo$ - ")
 }