block processor: recycle blocks to reduce allocation pressure

Instead of freeing/allocating blocks all the time in the locked,
serial path, use a free list to "recycle" blocks. Once a block is
no longer used, throw it onto the free list. If a new block is,
needed try to get one from the free list before calling malloc.

After a few iterations, the block processor should stop allocating
new blocks and only re-use the ones it already has.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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