Immediately destroy C++ state when deleteView is processed

Summary:
Followup to D26858584 (00959ffd6b). We should also immediately destroy C++ state memory (which will decrement a shared_ptr) when deleting a view.

This could improve memory while a surface is being used.

Changelog: [Internal]

Reviewed By: fkgozali

Differential Revision: D26876537

fbshipit-source-id: fc8353bed47db8fdbf5c7f6c6253ac788c460d9a

ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/SurfaceMountingManager.java

@@ -778,6 +778,12 @@ public class SurfaceMountingManager {
     // or StopSurface being called, so we do not handle deleting descendents of the View.
     mTagToViewState.remove(reactTag);
 
+    // Destroy state immediately instead of waiting for Java GC.
+    if (viewState.mStateWrapper != null) {
+      viewState.mStateWrapper.destroyState();
+      viewState.mStateWrapper = null;
+    }
+
     // For non-root views we notify viewmanager with {@link ViewManager#onDropInstance}
     ViewManager viewManager = viewState.mViewManager;
     if (!viewState.mIsRoot && viewManager != null) {