[StubIr] remove OVERRIDE from modalities

1. CEnum.value should be declared as open override in enums.
2. It is just incorrect.

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/ObjCStubs.kt

@@ -109,6 +109,8 @@ private class ObjCMethodStubBuilder(
     private val name: String = method.kotlinName
     private val origin = StubOrigin.ObjCMethod(method, container)
     private val modality: MemberStubModality
+    private val isOverride: Boolean =
+            container is ObjCClassOrProtocol && method.isOverride(container)
 
     init {
         val returnType = method.getReturnType(container.classOrProtocol)
@@ -127,14 +129,8 @@ private class ObjCMethodStubBuilder(
         kotlinMethodParameters = method.getKotlinParameters(context, forConstructorOrFactory = false)
         external = (container !is ObjCProtocol)
         modality = when (container) {
-            is ObjCClassOrProtocol -> {
-                if (method.isOverride(container)) {
-                    MemberStubModality.OVERRIDE
-                } else when (container) {
-                    is ObjCClass -> MemberStubModality.OPEN
-                    is ObjCProtocol -> MemberStubModality.ABSTRACT
-                }
-            }
+            is ObjCClass -> MemberStubModality.OPEN
+            is ObjCProtocol -> if (method.isOptional) MemberStubModality.OPEN else MemberStubModality.ABSTRACT
             is ObjCCategory -> MemberStubModality.FINAL
         }
         receiver = if (container is ObjCCategory) {
@@ -226,7 +222,9 @@ private class ObjCMethodStubBuilder(
                         annotations.toList(),
                         external,
                         receiver,
-                        modality),
+                        modality,
+                        emptyList(),
+                        isOverride),
                 replacement
         )
     }

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIr.kt

@@ -213,7 +213,8 @@ class PropertyStub(
         val modality: MemberStubModality = MemberStubModality.FINAL,
         val receiverType: StubType? = null,
         override val annotations: List<AnnotationStub> = emptyList(),
-        val origin: StubOrigin
+        val origin: StubOrigin,
+        val isOverride: Boolean = false
 ) : StubIrElement, AnnotationHolder {
     sealed class Kind {
         class Val(
@@ -332,7 +333,6 @@ class FunctionParameterStub(
 ) : AnnotationHolder
 
 enum class MemberStubModality {
-    OVERRIDE,
     OPEN,
     FINAL,
     ABSTRACT
@@ -430,7 +430,8 @@ class FunctionStub(
         val external: Boolean = false,
         val receiver: ReceiverParameterStub?,
         val modality: MemberStubModality,
-        val typeParameters: List<TypeParameterStub> = emptyList()
+        val typeParameters: List<TypeParameterStub> = emptyList(),
+        val isOverride: Boolean = false
 ) : StubElementWithOrigin, FunctionalStub {
 
     override fun <T, R> accept(visitor: StubIrVisitor<T, R>, data: T) =

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrElementBuilders.kt

@@ -214,8 +214,9 @@ internal class EnumStubBuilder(
                 name = "value",
                 type = baseType,
                 kind = PropertyStub.Kind.Val(PropertyAccessor.Getter.GetConstructorParameter(constructorParameter)),
-                modality = MemberStubModality.OVERRIDE,
-                origin = StubOrigin.Synthetic)
+                modality = MemberStubModality.OPEN,
+                origin = StubOrigin.Synthetic,
+                isOverride = true)
 
         val canonicalsByValue = enumDef.constants
                 .groupingBy { it.value }

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrTextEmitter.kt

@@ -185,8 +185,9 @@ class StubIrTextEmitter(
                 val parameters = element.parameters.joinToString(prefix = "(", postfix = ")") { renderFunctionParameter(it) }
                 val receiver = element.receiver?.let { renderFunctionReceiver(it) + "." } ?: ""
                 val typeParameters = renderTypeParameters(element.typeParameters)
+                val override = if (element.isOverride) "override " else ""
                 val modality = renderMemberModality(element.modality, owner)
-                "${modality}fun$typeParameters $receiver${element.name.asSimpleName()}$parameters: ${renderStubType(element.returnType)}"
+                "$override${modality}fun$typeParameters $receiver${element.name.asSimpleName()}$parameters: ${renderStubType(element.returnType)}"
             }
             if (!nativeBridges.isSupported(element)) {
                 sequenceOf(
@@ -302,7 +303,8 @@ class StubIrTextEmitter(
     private fun emitProperty(element: PropertyStub, owner: StubContainer?) {
         if (element in bridgeBuilderResult.excludedStubs) return
 
-        val modality = renderMemberModality(element.modality, owner)
+        val override = if (element.isOverride) "override " else ""
+        val modality = "$override${renderMemberModality(element.modality, owner)}"
         val receiver = if (element.receiverType != null) "${renderStubType(element.receiverType)}." else ""
         val name = if (owner?.isTopLevelContainer == true) {
             getTopLevelPropertyDeclarationName(kotlinFile, element.name)
@@ -374,7 +376,6 @@ class StubIrTextEmitter(
                 ""
             } else
                 when (modality) {
-                    MemberStubModality.OVERRIDE -> "override "
                     MemberStubModality.OPEN -> "open "
                     MemberStubModality.FINAL -> "final "
                     MemberStubModality.ABSTRACT -> "abstract "