MFV r252839:

Quoting illumos issue #3836:
  Currently zio_free() always puts the zio on a list for subsequent
  processing by zio_free_sync().  This is only necessary for frees that
  might need to issue reads (gang and dedup blocks).

  By processing the majority of the frees as we encounter them, we reduce
  the amount of time that the spa_sync() thread spends burning CPU and
  not doing any i/o, thus increasing the overall write throughput of the
  system.

Illumos ZFS issues:
  3836 zio_free() can be processed immediately in the common case

MFC after:	1 week

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