Override/Implement: Fix processing of unresolved types

#KT-17350 Fixed

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

@@ -214,6 +214,7 @@ interface DescriptorRendererOptions {
     var includeAdditionalModifiers: Boolean
     var parameterNamesInFunctionalTypes: Boolean
     var renderFunctionContracts: Boolean
+    var presentableUnresolvedTypes: Boolean
 }
 
 object ExcludedTypeAnnotations {

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

@@ -229,7 +229,11 @@ internal class DescriptorRendererImpl(
         this.renderAnnotations(type)
 
         if (type.isError) {
-            append(type.constructor.toString()) // Debug name of an error type is more informative
+            if (type is UnresolvedType && presentableUnresolvedTypes) {
+                append(type.presentableName)
+            } else {
+                append(type.constructor.toString()) // Debug name of an error type is more informative
+            }
             append(renderTypeArguments(type.arguments))
         }
         else {

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

@@ -115,4 +115,6 @@ internal class DescriptorRendererOptionsImpl : DescriptorRendererOptions {
     override var parameterNamesInFunctionalTypes: Boolean by property(true)
 
     override var renderFunctionContracts: Boolean by property(false)
+
+    override var presentableUnresolvedTypes: Boolean by property(false)
 }