Use meta object for storing associated Objective-C object

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/ContextUtils.kt

@@ -431,15 +431,6 @@ internal class Llvm(val context: Context, val llvmModule: LLVMModuleRef) {
     val Kotlin_ObjCExport_RethrowExceptionAsNSError by lazyRtFunction
     val Kotlin_ObjCExport_RethrowNSErrorAsException by lazyRtFunction
 
-    val kObjectReservedTailSize = if (context.config.produce.isNativeBinary) {
-        // Note: this defines the global declared in runtime (if any).
-        staticData.placeGlobal("kObjectReservedTailSize", Int32(0), isExported = true).also {
-            it.setConstant(true)
-        }
-    } else {
-        null
-    }
-
     val objCExportEnabled = if (context.config.produce.isNativeBinary) {
         // Note: this defines the global declared in runtime (if any).
         staticData.placeGlobal("objCExportEnabled", Int8(0), isExported = true).also {

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt

@@ -217,7 +217,6 @@ internal class ObjCExportCodeGenerator(
         emitSortedAdapters(placedClassAdapters, "Kotlin_ObjCExport_sortedClassAdapters")
         emitSortedAdapters(placedInterfaceAdapters, "Kotlin_ObjCExport_sortedProtocolAdapters")
 
-        context.llvm.kObjectReservedTailSize!!.setInitializer(Int32(runtime.pointerSize))
         context.llvm.objCExportEnabled!!.setInitializer(Int8(1))
 
         dataGenerator.finishModule() // TODO: move to appropriate place.