require.js: Delete dependency map after factory ran

Summary: Releases the dependency map of modules after running the factory in release mode in order to save memory.

Reviewed By: cpojer

Differential Revision: D5086693

fbshipit-source-id: 68c57a2f98182ed1a732e1336e6d4fe5ce27abc3

packager/src/Resolver/polyfills/require.js

@@ -177,6 +177,7 @@ function loadModuleImplementation(moduleId, module) {
     if (!__DEV__) {
       // $FlowFixMe: This is only sound because we never access `factory` again
       module.factory = undefined;
+      module.dependencyMap = undefined;
     }
 
     if (__DEV__) {