Break retain cycle in RCTLegacyViewManagerInteropCoordinator

Summary: Breaks retain cycle by having weak reference to bridge.

Reviewed By: shergin

Differential Revision: D21501419

fbshipit-source-id: 7526ceefceb59e296c6f4944cac5069cb62b33a5

Author: sammy-SC

ReactCommon/fabric/components/legacyviewmanagerinterop/RCTLegacyViewManagerInteropCoordinator.mm

@@ -20,7 +20,7 @@
 
 @implementation RCTLegacyViewManagerInteropCoordinator {
   RCTComponentData *_componentData;
-  RCTBridge *_bridge;
+  __weak RCTBridge *_bridge;
   /*
    Each instnace of `RCTLegacyViewManagerInteropComponentView` registers a block to which events are dispatched.
    This is the container that maps unretained UIView pointer to a block to which the event is dispatched.