Coalesce isHybrid and mHybridData field statics
Coalesce isHybrid and mHybridData field statics

Summary: Having one static instead of two should reduce both synchronization overhead and code size.

Reviewed By: mhorowitz

Differential Revision: D19339877

fbshipit-source-id: 50078911ec9102b094d7ec322ce132940adb7ed7

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