Use an atomic bool to track bridge destruction

Summary: We're seeing intermittent crashes in ~Bridge() where m_destroyed isn't set. This could be because the value of m_destroyed is cached for the destructing thread and doesn't see that the value got updated. Using an atomic boolean should fix this.

Reviewed By: mhorowitz

Differential Revision: D3126701

fb-gh-sync-id: 5887edef748cc05971765943de80187ab7fd8ede
fbshipit-source-id: 5887edef748cc05971765943de80187ab7fd8ede

ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java

@@ -406,6 +406,12 @@ public class CatalystInstanceImpl implements CatalystInstance {
     }
   }
 
+  @Override
+  protected void finalize() throws Throwable {
+    Assertions.assertCondition(mDestroyed, "Bridge was not destroyed before finalizer!");
+    super.finalize();
+  }
+
   private class NativeModulesReactCallback implements ReactCallback {
 
     @Override