Annotations on type aliases: typealias is not a "default target".

Add diagnostic test for annotations on type aliases.

compiler/testData/loadJava/compiledKotlin/typealias/Annotations.kt

@@ -1,6 +1,7 @@
 //ALLOW_AST_ACCESS
 package test
 
+@Target(AnnotationTarget.TYPEALIAS)
 annotation class Ann(val value: String = "")
 
 @Ann()

compiler/testData/loadJava/compiledKotlin/typealias/Annotations.txt

@@ -1,6 +1,6 @@
 package test
 
-public final annotation class Ann : kotlin.Annotation {
+@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.TYPEALIAS}) public final annotation class Ann : kotlin.Annotation {
     /*primary*/ public constructor Ann(/*0*/ value: kotlin.String = ...)
     public final val value: kotlin.String
         public final fun <get-value>(): kotlin.String