Add EnumEntries to minimal-stdlib-for-tests

This change allows to revert adding `WITH_STDLIB` directive
to tests which happened at `a9343aeb`.

Co-authored-by: Alexander Udalov <Alexander.Udalov@jetbrains.com>

compiler/testData/ir/irText/classes/classes.kt.txt

@@ -40,4 +40,7 @@ enum class TestEnumClass : Enum<TestEnumClass> {
 
   fun valueOf(value: String): TestEnumClass /* Synthetic body for ENUM_VALUEOF */
 
+  val entries: EnumEntries<TestEnumClass>
+    get(): EnumEntries<TestEnumClass> /* Synthetic body for ENUM_ENTRIES */
+
 }