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9485 Optimize possible split block search space #625

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  1. 9485 Optimize possible split block search space

    Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
    Reviewed-by: Tim Chase <tim@chase2k.com>
    Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
    Reviewed by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
    
    Remove duplicate segment copies to minimize the possible search
    space for reconstruction.  Once reduced an accurate assessment can
    be made regarding the difficulty in reconstructing the block.
    
    Also, ztest will now run zdb with
    zfs_reconstruct_indirect_combinations_max set to 1000000 in an attempt
    to avoid checksum errors.
    
    Closes #625
    behlendorf authored and Prakash Surya committed Feb 14, 2019
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