Lock the creation of unordered reduce chain but not the actual reduce
Summary: Before this diff, since `ctx->memo_` starts out in the `OnlyResult` state, the first reduce (and therefore all subsequent reduces) are run immediately inside the lock. Reviewed By: yfeldblum Differential Revision: D8319067 fbshipit-source-id: 5ed08885beefb42c6efb61768fcbc36e0a08a46b
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