Ifpack2: performance speedup for getLocalRowCopy in LocalFilter

James Willenbring requested to merge muelu:ifpack2 into develop

Created by: aprokop

If we have a single processor or in serial, there is no reason to go through each element in a row to determine whether it belongs to us.

On a serial run, I was getting around 15-20% improvement for Vanka smoothing (BLOCK_RELAXATION).

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