Kotlin: extract isEnumConstant relation

Author: tamasvajk

java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt

@@ -1054,6 +1054,7 @@ open class KotlinFileExtractor(
                 tw.writeFieldsKotlinType(id, type.kotlinResult.id)
                 val locId = tw.getLocation(ee)
                 tw.writeHasLocation(id, locId)
+                tw.writeIsEnumConst(id)
 
                 if (extractTypeAccess) {
                     val fieldDeclarationId = tw.getFreshIdLabel<DbFielddecl>()

java/ql/test/kotlin/library-tests/enum/test.expected

@@ -1,4 +1,7 @@
 enumConstants
+| enumUser.kt:3:16:3:17 | A |
+| enumUser.kt:3:19:3:20 | B |
+| enumUser.kt:3:22:3:22 | C |
 #select
 | addAll |
 | addRange |