[KAPT+IR] Use ErrorType for unresolved delegate class.

^KT-57946

plugins/kapt3/kapt3-compiler/testData/converter/unresolvedDelegateExpression.kt

@@ -9,4 +9,12 @@ class B : NonExisting {
     val a: String by flaf()
 }
 
+interface I
+
+@Suppress("UNRESOLVED_REFERENCE")
+class D : I by NonExisting
+
 fun C.flaf() = "OK"
+
+@Suppress("UNRESOLVED_REFERENCE", "DELEGATION_NOT_TO_INTERFACE")
+class E : NonExisting by NonExisting