Generate IR for annotation class constructors.

compiler/testData/ir/irText/expressions/signedToUnsignedConversions.kt.txt

@@ -1,8 +1,12 @@
 // FILE: signedToUnsignedConversions_annotation.kt
 package kotlin.internal
 
-annotation class ImplicitIntegerCoercion : Annotation {
-  constructor() /* primary */
+open annotation class ImplicitIntegerCoercion : Annotation {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
 
 }
 
@@ -65,4 +69,3 @@ fun test() {
   takeULong(u = <get-IMPLICIT_INT>().toULong())
   takeUBytes(u = [<get-IMPLICIT_INT>().toUByte(), <get-EXPLICIT_INT>().toUByte(), 42B])
 }
-

compiler/testData/ir/irText/expressions/signedToUnsignedConversions.txt

@@ -1,7 +1,10 @@
 FILE fqName:kotlin.internal fileName:/signedToUnsignedConversions_annotation.kt
-  CLASS ANNOTATION_CLASS name:ImplicitIntegerCoercion modality:FINAL visibility:public superTypes:[kotlin.Annotation]
+  CLASS ANNOTATION_CLASS name:ImplicitIntegerCoercion modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:kotlin.internal.ImplicitIntegerCoercion
     CONSTRUCTOR visibility:public <> () returnType:kotlin.internal.ImplicitIntegerCoercion [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS ANNOTATION_CLASS name:ImplicitIntegerCoercion modality:OPEN visibility:public superTypes:[kotlin.Annotation]'
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.Annotation