kt1770.kt test rewrote during migration to 171 platform

compiler/testData/codegen/box/fullJdk/regressions/kt1770.kt

@@ -2,21 +2,16 @@
 // IGNORE_BACKEND: JS, NATIVE
 
 // FULL_JDK
+// WITH_RUNTIME
 
+//This front-end problem test added to box ones only cause of FULL_JDK support
 import org.w3c.dom.Element
-import org.xml.sax.InputSource
-import javax.xml.parsers.DocumentBuilderFactory
-import java.io.StringReader
 
 class MyElement(e: Element): Element by e {
     fun bar() = "OK"
 }
 
 fun box() : String {
-    val factory = DocumentBuilderFactory.newInstance()!!;
-    val builder = factory.newDocumentBuilder()!!;
-    val source = InputSource(StringReader("<OK></OK>"));
-    val doc = builder.parse(source)!!;
-    val myElement = MyElement(doc.getDocumentElement()!!)
-    return myElement.getTagName()!!
+    val touch = MyElement::class.java
+    return "OK"
 }