Add test for top level typealias

Author: hfmehmed

kotlin-analysis-api/testData/nestedTypeAlias.kt

@@ -2,6 +2,7 @@
 // EXPECTED:
 // nestedAlias : NestedAlias = String = (expanded) String
 // nestedClass : Nested = (expanded) Nested
+// useOfAliasTop : Top = NestedAlias = String = (expanded) String
 // param w.o. asMemberOf: NestedAlias = String = (expanded) String
 // param with asMemberOf: NestedAlias = String = (expanded) String
 // param: C.NestedAlias: NestedAlias = String = (expanded) String
@@ -12,7 +13,10 @@ class C {
     class Nested
 }
 
+typealias Top = C.NestedAlias
+
 val nestedAlias: C.NestedAlias = ""
 val nestedClass: C.Nested = C.Nested()
+val useOfAliasTop: Top = ""
 
 class Subject(val param: C.NestedAlias)