Summary:
Calls abort() in cases where malloc returns NULL.
Checking the return value from malloc is good practice and is
required to pass a [Veracode security scan](https://www.veracode.com/). This will let
developers who are required to submit their software to Veracode
use React Native.
Pull Request resolved: https://github.com/facebook/react-native/pull/20173
Differential Revision: D9235096
Pulled By: hramos
fbshipit-source-id: 9fdc97f9e84f8d4d91ae59242093907f7a81d286
b21d4914de