Pass context by reference in the futures Core
Pass context by reference in the futures Core

Summary: [Folly] Pass context by reference in the futures `Core`, saving on code size and a small on runtime performance due to code size.

Reviewed By: Orvid

Differential Revision: D15073282

fbshipit-source-id: 7c55b9f6a55ee7ec22fde6f3ab9da232a8ee006b

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