Calculate inner class access flags accurately

compiler/testData/codegen/innerClassInfo/innerAccessFlags.kt

@@ -0,0 +1,21 @@
+class A {
+    // Kind
+    annotation class Annotation
+    enum class Enum
+    trait Trait
+
+    // Modality
+    open class OpenStaticClass
+    class FinalStaticClass
+    abstract class AbstractStaticClass
+
+    open inner class OpenInnerClass
+    inner class FinalInnerClass
+    abstract inner class AbstractInnerClass
+
+    // Visibility
+    private open inner class PrivateClass
+    protected open inner class ProtectedClass
+    internal open inner class InternalClass
+    public open inner class PublicClass
+}