Minor: expose DescriptorRender#renderMessage

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRenderer.kt

@@ -34,6 +34,8 @@ abstract class DescriptorRenderer : Renderer<DeclarationDescriptor> {
         return DescriptorRendererImpl(options)
     }
 
+    abstract fun renderMessage(message: String): String
+
     abstract fun renderType(type: KotlinType): String
 
     abstract fun renderTypeArguments(typeArguments: List<TypeProjection>): String

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -78,7 +78,7 @@ internal class DescriptorRendererImpl(
         }
     }
 
-    private fun renderMessage(message: String): String {
+    override fun renderMessage(message: String): String {
         return when (textFormat) {
             RenderingFormat.PLAIN -> message
             RenderingFormat.HTML -> "<i>$message</i>"