DefaultAsserter object. Add function to replace constructor invoke.

libraries/kotlin.test/jvm/src/main/kotlin/AsserterLookup.kt

@@ -9,12 +9,10 @@ import java.util.ServiceLoader
 
 private val contributors = ServiceLoader.load(AsserterContributor::class.java).toList()
 
-private val defaultAsserter = DefaultAsserter()
-
 internal actual fun lookupAsserter(): Asserter {
     for (contributor in contributors) {
         val asserter = contributor.contribute()
         if (asserter != null) return asserter
     }
-    return defaultAsserter
+    return DefaultAsserter
 }