Clear internal maps of NativeModuleRegistry during turn down of the bridge

Summary:
This diff clears the internal maps of NativeModuleRegistry during turn down of the bridge.

This is necessary for a proper cleanup of these modules.

changelog: [internal] internal

Reviewed By: ShikaSD

Differential Revision: D26239303

fbshipit-source-id: 6e98e5db60a4f54d02e99b03339b03c17ecc183d

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

@@ -44,5 +44,6 @@ public class JSIModuleRegistry {
       JSIModuleHolder moduleHolder = entry.getValue();
       moduleHolder.notifyJSInstanceDestroy();
     }
+    mModules.clear();
   }
 }

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

@@ -84,6 +84,7 @@ public class NativeModuleRegistry {
       for (ModuleHolder module : mModules.values()) {
         module.destroy();
       }
+      mModules.clear();
     } finally {
       Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
     }