Tests for not reproduced KT-1770, KT-3001 and KT-3414

#KT-3414 Can't Reproduced
 #KT-3001 Can't Reproduced
 #KT-1770 Can't Reproduced

compiler/testData/codegen/box/classes/kt3001.kt

@@ -0,0 +1,11 @@
+trait A {
+    val result: String
+}
+
+class Base(override val result: String) : A
+
+open class Derived : A by Base("OK")
+
+class Z : Derived()
+
+fun box() = Z().result

compiler/testData/codegen/box/classes/kt3414.kt

@@ -0,0 +1,18 @@
+trait A {
+    fun foo(): Int
+}
+
+trait B {
+    fun foo(): Int
+}
+
+class Z(val a: A) : A by a, B
+
+fun box(): String {
+    val s = Z(object : A {
+        override fun foo(): Int {
+            return 1;
+        }
+    });
+    return if (s.foo() == 1) "OK" else "fail"
+}

compiler/testData/codegen/boxWithStdlib/regressions/kt1770.kt

@@ -0,0 +1,17 @@
+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()!!
+}