'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()

compiler/testData/codegen/light-analysis/typealias/kt15109.txt

@@ -0,0 +1,18 @@
+@kotlin.Metadata
+public class A {
+    private final field s: java.lang.String
+    public @synthetic.kotlin.jvm.GeneratedByJvmOverloads method <init>(): void
+    public method <init>(@org.jetbrains.annotations.NotNull p0: java.lang.String): void
+    public synthetic method <init>(p0: java.lang.String, p1: int, p2: kotlin.jvm.internal.DefaultConstructorMarker): void
+    public final @org.jetbrains.annotations.NotNull method foo(): java.lang.String
+}
+
+@kotlin.Metadata
+public final class C {
+    public method <init>(): void
+}
+
+@kotlin.Metadata
+public final class Kt15109Kt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}