Do not require freezing for Worker.executeAfter on experimental MM

kotlin-native/backend.native/tests/build.gradle

@@ -949,7 +949,11 @@ task worker8(type: KonanLocalTest) {
 
 task worker9(type: KonanLocalTest) {
     enabled = (project.testTarget != 'wasm32') // Workers need pthreads.
-    goldValue = "zzz\n42\nOK\nfirst 2\nsecond 3\nfrozen OK\n"
+    if (isExperimentalMM) {
+        goldValue = "zzz\n42\nOK\nfirst 2\nsecond 3\nunfrozen OK\nfrozen OK\n"
+    } else {
+        goldValue = "zzz\n42\nOK\nfirst 2\nsecond 3\nfrozen OK\n"
+    }
     source = "runtime/workers/worker9.kt"
 }
 

kotlin-native/backend.native/tests/runtime/workers/worker9.kt

@@ -43,9 +43,15 @@ fun withLock(op: () -> Unit) {
 
 @Test fun runTest3() {
     val worker = Worker.start()
-    assertFailsWith<IllegalStateException> {
+    if (Platform.memoryModel == MemoryModel.EXPERIMENTAL) {
         worker.executeAfter {
-            println("shall not happen")
+            println("unfrozen OK")
+        }
+    } else {
+        assertFailsWith<IllegalStateException> {
+            worker.executeAfter {
+                println("shall not happen")
+            }
         }
     }
     assertFailsWith<IllegalArgumentException> {

kotlin-native/runtime/src/main/kotlin/kotlin/native/concurrent/Worker.kt

@@ -106,7 +106,7 @@ public inline class Worker @PublishedApi internal constructor(val id: Int) {
      */
     public fun executeAfter(afterMicroseconds: Long = 0, operation: () -> Unit): Unit {
         val current = currentInternal()
-        if (current != id && !operation.isFrozen) throw IllegalStateException("Job for another worker must be frozen")
+        if (Platform.memoryModel != MemoryModel.EXPERIMENTAL && current != id && !operation.isFrozen) throw IllegalStateException("Job for another worker must be frozen")
         if (afterMicroseconds < 0) throw IllegalArgumentException("Timeout parameter must be non-negative")
         executeAfterInternal(id, operation, afterMicroseconds)
     }