Summary:
Replaces the keywords var with const in Libraries/merge.js
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- [x] Check npm run flow
- [x] Check npm run flow-check-ios
- [x] Check npm run flow-check-android
[GENERAL] [ENHANCEMENT] [Libraries/core] - remove var
Pull Request resolved: https://github.com/facebook/react-native/pull/22108
Differential Revision: D12919282
Pulled By: TheSavior
fbshipit-source-id: e3c8569c47c95ad3d1a061917c90185c2694c78f