IR KT-50039 don't initialize outer 'this' in delegating constructor

compiler/testData/codegen/box/innerNested/superConstructorCall/objectExtendsInnerDefaultArgument.kt

@@ -10,3 +10,8 @@ class A {
 }
 
 fun box() = A().box()
+
+// CHECK_BYTECODE_TEXT
+// 1 PUTFIELD A\$Inner\.this\$0 : LA;
+//  ^ A$Inner.this$0 SHOULD be written in primary constructor of A$Inner,
+//    and SHOULD NOT be written in corresponding default arguments stub.

compiler/testData/codegen/box/innerNested/superConstructorCall/objectExtendsInnerWithDelegatingConstructor.kt

@@ -0,0 +1,17 @@
+class Outer(val outer: String) {
+    open inner class Inner(val inner: String) {
+        constructor() : this("K")
+
+        fun test() = outer + inner
+    }
+
+    fun obj(): Inner =
+        object : Inner() {}
+}
+
+fun box() = Outer("O").obj().test()
+
+// CHECK_BYTECODE_TEXT
+// 1 PUTFIELD Outer\$Inner\.this\$0 : LOuter;
+//  ^ Outer$Inner.this$0 SHOULD be written in primary constructor of Outer$Inner,
+//    and SHOULD NOT be written in delegating constructor.