Use 'mapToCallableMethod' for delegateTo signature calculation

#KT-9707 Fixed

compiler/testData/codegen/box/bridges/delegationComplex.kt

@@ -0,0 +1,17 @@
+open class Content() {
+    override fun toString() = "OK"
+}
+
+interface Box<E> {
+    fun get(): E
+}
+
+interface ContentBox<T : Content> : Box<T>
+
+object Impl : ContentBox<Content> {
+    override fun get(): Content = Content()
+}
+
+class ContentBoxDelegate<T : Content>() : ContentBox<T> by (Impl as ContentBox<T>)
+
+fun box() = ContentBoxDelegate<Content>().get().toString()

compiler/testData/codegen/box/bridges/delegationComplexWithList.kt

@@ -0,0 +1,18 @@
+import java.util.*
+
+open class Content() {
+    override fun toString() = "OK"
+}
+
+interface ContentBox<T : Content> : List<T>
+
+object Impl : ContentBox<Content> , AbstractList<Content>() {
+    override fun get(index: Int) = Content()
+
+    override val size: Int
+        get() = throw UnsupportedOperationException()
+}
+
+class ContentBoxDelegate<T : Content>() : ContentBox<T> by (Impl as ContentBox<T>)
+
+fun box() = ContentBoxDelegate<Content>()[0].toString()