Generate IR for annotation class constructors.

compiler/testData/ir/irText/declarations/annotations/enumEntriesWithAnnotations.kt.txt

@@ -1,5 +1,10 @@
-annotation class TestAnn : Annotation {
-  constructor(x: String) /* primary */ 
+open annotation class TestAnn : Annotation {
+  constructor(x: String) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
   val x: String
     field = x
     get
@@ -37,4 +42,3 @@ open enum class TestEnum : Enum<TestEnum> {
   fun valueOf(value: String): TestEnum /* Synthetic body for ENUM_VALUEOF */
 
 }
-