change BOrder constant to 4 to set correct field bits
change BOrder constant to 4 to set correct field bits

Summary: These constants are used for setting bit fields so they should be in power of 2

Reviewed By: davidaurelio

Differential Revision: D14384999

fbshipit-source-id: fa1f6994c874aff7a039ca98d5947cba317fa749

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