[K2, MPP] Actualize value class representation

^KT-63638 fixed

compiler/testData/codegen/box/multiplatform/k2/basic/valueClassOfExpectClass.kt

@@ -0,0 +1,39 @@
+// ISSUE: KT-63638
+// !LANGUAGE: +MultiPlatformProjects
+// TARGET_BACKEND: JVM_IR
+// WITH_STDLIB
+
+// MODULE: common
+// TARGET_PLATFORM: Common
+// FILE: expect.kt
+
+import kotlin.jvm.JvmInline
+
+class Session<T>(val value: T)
+
+@JvmInline
+value class SessionMutex<T> private constructor(
+    private val currentSessionHolder: AtomicReference<Session<T>?>
+) {
+    constructor() : this(AtomicReference(null))
+
+    val currentSession: T?
+        get() = currentSessionHolder.get()?.value
+}
+
+expect class AtomicReference<V>(value: V) {
+    fun get(): V
+    fun set(value: V)
+    fun getAndSet(value: V): V
+    fun compareAndSet(expect: V, newValue: V): Boolean
+}
+
+// MODULE: main()()(common)
+// FILE: actual.kt
+
+internal actual typealias AtomicReference<V> = java.util.concurrent.atomic.AtomicReference<V>
+
+fun box(): String {
+    val mutex = SessionMutex<Int>()
+    return "OK"
+}