Don't pass around references to the scrach buffer #90
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Motivation
The scratch buffer is primarily used on cold paths (split reads during streaming or handling the last few tags in a block). Therefore, the value in reducing range checks, etc, by passing the reference around is minimal. This is mostly a holdover from when we pinned the reference, which was more important due to pinning cost.
Modifications
Stop passing the reference to the subroutines, just make a reference as needed.