Allow sharing top level vals with types marked as frozen. (#2086)

backend.native/tests/build.gradle

@@ -659,6 +659,12 @@ task worker9(type: RunKonanTest) {
     source = "runtime/workers/worker9.kt"
 }
 
+task worker10(type: RunKonanTest) {
+    disabled = (project.testTarget == 'wasm32') // Workers need pthreads.
+    goldValue = "OK\n"
+    source = "runtime/workers/worker10.kt"
+}
+
 task freeze0(type: RunKonanTest) {
     disabled = (project.testTarget == 'wasm32') // No workers on WASM.
     goldValue = "frozen bit is true\n" +

backend.native/tests/runtime/workers/worker10.kt

@@ -0,0 +1,81 @@
+package runtime.workers.worker10
+
+import kotlin.test.*
+
+import kotlin.native.concurrent.*
+
+class Data(val x: Int)
+
+val topInt = 1
+val topString = "string"
+var topStringVar = "string"
+val topSharedStringWithGetter: String
+        get() = "top"
+val topData = Data(42)
+@SharedImmutable
+val topSharedData = Data(43)
+
+@Test fun runTest() {
+    val worker = Worker.start()
+
+    assertEquals(1, topInt)
+    assertEquals("string", topString)
+    assertEquals(42, topData.x)
+    assertEquals(43, topSharedData.x)
+    assertEquals("top", topSharedStringWithGetter)
+
+    worker.execute(TransferMode.SAFE, { -> }, {
+        it -> topInt == 1
+    }).consume {
+        result -> assertEquals(true, result)
+    }
+
+    worker.execute(TransferMode.SAFE, { -> }, {
+        it -> topString == "string"
+    }).consume {
+        result -> assertEquals(true, result)
+    }
+
+    worker.execute(TransferMode.SAFE, { -> }, {
+        it -> try {
+        topStringVar == "string"
+    } catch (e: IncorrectDereferenceException) {
+        false
+    }
+    }).consume {
+        result -> assertEquals(false, result)
+    }
+
+    worker.execute(TransferMode.SAFE, { -> }, {
+        it -> try {
+        topSharedStringWithGetter == "top"
+    } catch (e: IncorrectDereferenceException) {
+        false
+    }
+    }).consume {
+        result -> assertEquals(true, result)
+    }
+
+    worker.execute(TransferMode.SAFE, { -> }, {
+        it -> try {
+            topData.x == 42
+        } catch (e: IncorrectDereferenceException) {
+            false
+        }
+    }).consume {
+        result -> assertEquals(false, result)
+    }
+
+    worker.execute(TransferMode.SAFE, { -> }, {
+        it -> try {
+            topSharedData.x == 43
+        } catch (e: Throwable) {
+            false
+        }
+    }).consume {
+        result -> assertEquals(true, result)
+    }
+
+    worker.requestTermination().result
+    println("OK")
+}