Fix sections that come from React Fiber

Reviewed By: fkgozali

Differential Revision: D6235187

fbshipit-source-id: 55a49da9d81204f7a6199420beca1b096f7ea212

Libraries/Core/InitializeCore.js

@@ -101,6 +101,7 @@ if (!global.process.env.NODE_ENV) {
 // Setup the Systrace profiling hooks if necessary
 if (global.__RCTProfileIsProfiling) {
   const Systrace = require('Systrace');
+  Systrace.installReactHook(true);
   Systrace.setEnabled(true);
 }