reading abstract and final modifiers from binary classes

compiler/testData/readClass/fun/ModifierAbstract.kt

@@ -0,0 +1,5 @@
+namespace test
+
+abstract class ModifierAbstract {
+    abstract fun abs(): Int
+}

compiler/testData/readClass/fun/ModifierOpen.kt

@@ -0,0 +1,5 @@
+namespace test
+
+open class ModifierOpen {
+    open fun abs() = 1
+}