Make 'controller' field package-private

To make it accessible from nested lambdas

 #KT-12974 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineCodegen.kt

@@ -58,7 +58,7 @@ class CoroutineCodegen(
 
     override fun generateClosureBody() {
         v.newField(
-                JvmDeclarationOrigin.NO_ORIGIN, Opcodes.ACC_PRIVATE or Opcodes.ACC_VOLATILE,
+                JvmDeclarationOrigin.NO_ORIGIN, AsmUtil.NO_FLAG_PACKAGE_PRIVATE or Opcodes.ACC_VOLATILE,
                 COROUTINE_CONTROLLER_FIELD_NAME,
                 typeMapper.mapType(controllerType).descriptor, null, null)
 

compiler/testData/codegen/box/coroutines/controllerAccessFromInnerLambda.kt

@@ -0,0 +1,37 @@
+class Controller {
+    var result = false
+    suspend fun suspendHere(x: Continuation<String>) {
+        x.resume("OK")
+    }
+
+    fun foo() {
+        result = true
+    }
+}
+
+fun builder(coroutine c: Controller.() -> Continuation<Unit>) {
+    val controller = Controller()
+    c(controller).resume(Unit)
+    if (!controller.result) throw java.lang.RuntimeException("fail")
+}
+
+fun noinlineRun(block: () -> Unit) {
+    block()
+}
+
+fun box(): String {
+    builder {
+        if (suspendHere() != "OK") {
+            throw java.lang.RuntimeException("fail 1")
+        }
+        noinlineRun {
+            foo()
+        }
+
+        if (suspendHere() != "OK") {
+            throw java.lang.RuntimeException("fail 2")
+        }
+    }
+
+    return "OK"
+}

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -4153,6 +4153,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/coroutines"), Pattern.compile("^(.+)\\.kt$"), true);
         }
 
+        @TestMetadata("controllerAccessFromInnerLambda.kt")
+        public void testControllerAccessFromInnerLambda() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/controllerAccessFromInnerLambda.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("defaultParametersInSuspend.kt")
         public void testDefaultParametersInSuspend() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/defaultParametersInSuspend.kt");