Update Kotlin to 1.9.21 (#3954)

* Update Kotlin to 1.9.21
* Update atomicfu to a version released with 1.9.21 to address KT-62515
* Enable K/N atomicfu transformations

README.md

@@ -4,11 +4,11 @@
 [![JetBrains official project](https://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 [![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Download](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.7.2)](https://central.sonatype.com/artifact/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.7.2)
-[![Kotlin](https://img.shields.io/badge/kotlin-1.9.20-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-1.9.21-blue.svg?logo=kotlin)](http://kotlinlang.org)
 [![Slack channel](https://img.shields.io/badge/chat-slack-green.svg?logo=slack)](https://kotlinlang.slack.com/messages/coroutines/)
 
 Library support for Kotlin coroutines with [multiplatform](#multiplatform) support.
-This is a companion version for the Kotlin `1.9.20` release.
+This is a companion version for the Kotlin `1.9.21` release.
 
 ```kotlin
 suspend fun main() = coroutineScope {
@@ -93,7 +93,7 @@ And make sure that you use the latest Kotlin version:
 
 ```xml
 <properties>
-    <kotlin.version>1.9.20</kotlin.version>
+    <kotlin.version>1.9.21</kotlin.version>
 </properties>
 ```
 
@@ -112,10 +112,10 @@ And make sure that you use the latest Kotlin version:
 ```kotlin
 plugins {
     // For build.gradle.kts (Kotlin DSL)
-    kotlin("jvm") version "1.9.20"
+    kotlin("jvm") version "1.9.21"
 
     // For build.gradle (Groovy DSL)
-    id "org.jetbrains.kotlin.jvm" version "1.9.20"
+    id "org.jetbrains.kotlin.jvm" version "1.9.21"
 }
 ```
 

gradle.properties

@@ -5,12 +5,12 @@
 # Kotlin
 version=1.7.2-SNAPSHOT
 group=org.jetbrains.kotlinx
-kotlin_version=1.9.20
+kotlin_version=1.9.21
 
 # Dependencies
 junit_version=4.12
 junit5_version=5.7.0
-atomicfu_version=0.22.0
+atomicfu_version=0.23.1
 knit_version=0.4.0
 html_version=0.7.2
 lincheck_version=2.18.1
@@ -46,3 +46,4 @@ kotlinx.atomicfu.enableJvmIrTransformation=true
 # When the flag below is set to `true`, AtomicFU cannot process
 # usages of `moveForward` in `ConcurrentLinkedList.kt` correctly.
 kotlinx.atomicfu.enableJsIrTransformation=false
+kotlinx.atomicfu.enableNativeIrTransformation=true

integration-testing/gradle.properties

@@ -1,4 +1,4 @@
-kotlin_version=1.9.20
+kotlin_version=1.9.21
 coroutines_version=1.7.2-SNAPSHOT
 asm_version=9.3
 

kotlinx-coroutines-core/native/test/TestBase.kt

@@ -17,8 +17,8 @@ public actual typealias TestResult = Unit
 
 public actual open class TestBase actual constructor() {
     public actual val isBoundByJsTestTimeout = false
-    private var actionIndex = atomic(0)
-    private var finished = atomic(false)
+    private val actionIndex = atomic(0)
+    private val finished = atomic(false)
     private var error: Throwable? = null
 
     /**