block processor: promote fragments to fragment blocks

Instead of [potentially] allocating a new fragment block, take an
existing fragment and promote it to the fragmenet block. This saves
as a potential block allocation and a memcpy of the initial data.

Also it *definitely* removes block allocation from the backend path
of the block processor.

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

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