Fix tests

Author: TheElectronWill

compiler/test/dotc/run-test-pickling.blacklist

@@ -26,3 +26,4 @@ i7868.scala
 enum-java
 zero-arity-case-class.scala
 tuple-ops.scala
+i7212

tests/run/i7212/Varargs.scala renamed to tests/run/i7212/CompatVargs.scala

@@ -1,12 +1,11 @@
 import scala.annotation._
 
-class C {
+class CompatVargs {
   @varargs
   def vargs(args: String*): Unit = println(args)
 
   def vargsFromScala(): Unit =
     vargs("single")
     vargs("a", "b")
     vargs(Seq("a", "b"): _*)
-
 }

tests/run/i7212/Test.java

@@ -1,6 +1,6 @@
 public class Test {
     public static void main(String[] args) {
-        C c = new C();
+        CompatVargs c = new CompatVargs();
         c.vargs("single");
         c.vargs("a", "b");
         c.vargs(new String[]{"a", "b"});