Summary:
This changes Clang format config to enforce left pointer alignment instead of right, in accordance with https://www.internalfb.com/intern/wiki/Cpp/CppStyle/

Changelog: [Internal]

bypass-github-export-checks

Reviewed By: sammy-SC

Differential Revision: D48952040

fbshipit-source-id: 108329b2f11d2041a31dee3334c7801d69a3f1ad