Add test for class delegation with private constructor

#KT-16583 Obsolete

compiler/testData/codegen/box/delegation/delegationWithPrivateConstructor.kt

@@ -0,0 +1,17 @@
+class MyObject private constructor(val delegate: Interface) : Interface by delegate {
+    constructor() : this(Delegate())
+}
+
+class Delegate : Interface {
+    override fun greet(): String {
+        return "OK"
+    }
+}
+
+private interface Interface {
+    fun greet(): String
+}
+
+fun box(): String {
+    return MyObject().greet()
+}

compiler/testData/codegen/light-analysis/delegation/delegationWithPrivateConstructor.txt

@@ -0,0 +1,24 @@
+@kotlin.Metadata
+public final class Delegate {
+    public method <init>(): void
+    public @org.jetbrains.annotations.NotNull method greet(): java.lang.String
+}
+
+@kotlin.Metadata
+public final class DelegationWithPrivateConstructorKt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}
+
+@kotlin.Metadata
+interface Interface {
+    public abstract @org.jetbrains.annotations.NotNull method greet(): java.lang.String
+}
+
+@kotlin.Metadata
+public final class MyObject {
+    private final @org.jetbrains.annotations.NotNull field delegate: Interface
+    public method <init>(): void
+    private method <init>(p0: Interface): void
+    public final @org.jetbrains.annotations.NotNull method getDelegate(): Interface
+    public @org.jetbrains.annotations.NotNull method greet(): java.lang.String
+}