Make sure ARGS and HAS_BLOCK are still acceessible (without big changes)

Author: NullVoxPopuli

packages/@ember/-internals/glimmer/lib/component-managers/curly.ts

@@ -261,7 +261,6 @@ export default class CurlyComponentManager
 
     beginTrackFrame();
     let props = processComponentArgs(capturedArgs);
-    props[ARGS] = capturedArgs;
     let argsTag = endTrackFrame();
 
     // Alias `id` argument to `elementId` property on the component instance.
@@ -271,11 +270,6 @@ export default class CurlyComponentManager
     // component.
     props.parentView = parentView;
 
-    // Set whether this component was invoked with a block
-    // (`{{#my-component}}{{/my-component}}`) or without one
-    // (`{{my-component}}`).
-    props[HAS_BLOCK] = hasBlock;
-
     // Save the current `this` context of the template as the component's
     // `_target`, so bubbled actions are routed to the right place.
     props._target = valueForRef(callerSelfRef);
@@ -293,6 +287,12 @@ export default class CurlyComponentManager
     beginUntrackFrame();
     let component = ComponentClass.create(props);
 
+    // Set internal symbol-keyed properties directly on the instance.
+    // These are not passed through create() because Object.keys() doesn't
+    // enumerate Symbol properties.
+    (component as any)[ARGS] = capturedArgs;
+    (component as any)[HAS_BLOCK] = hasBlock;
+
     let finalizer = _instrumentStart('render.component', initialRenderInstrumentDetails, component);
 
     // We become the new parentView for downstream components, so save our