'ConstructorDescriptor#getConstructedClass()' should be used to obtain a descriptor for constructed class

(it can be different from 'getContainingDeclaration()' in case of type alias constructor).

KT-15109 Subclass from a type alias with named parameter in constructor will produce compiler exception
KT-15192 Compiler crashes on certain companion objects: "Error generating constructors of class Companion with kind IMPLEMENTATION"

compiler/testData/codegen/box/typealias/kt15109.kt

@@ -0,0 +1,9 @@
+open class A(private val s: String = "") {
+    fun foo() = s
+}
+
+typealias B = A
+
+class C : B(s = "OK")
+
+fun box() = C().foo()