JVM_IR KT-44744 check accessibility of enum entry 'this'

compiler/testData/codegen/box/enum/kt44744.kt

@@ -0,0 +1,22 @@
+enum class ContentType {
+
+    PLAIN_TEXT {
+        override fun convert(text: String, targetType: ContentType): String {
+            return text
+        }
+    },
+
+    MARKDOWN {
+        override fun convert(text: String, targetType: ContentType): String {
+            return when (targetType) {
+                MARKDOWN -> text
+                PLAIN_TEXT -> ""
+            }
+        }
+    };
+
+    abstract fun convert(text: String, targetType: ContentType): String
+}
+
+fun box() =
+    ContentType.PLAIN_TEXT.convert("OK", ContentType.PLAIN_TEXT)