Xin LI 439024135c MFV r254749:
Don't hold dd_lock for long by breaking it when not doing dsl_dir
accounting.  It is not necessary to hold the lock while manipulating
the parent's accounting, because there is no interface for userland
to see a consistent picture of both parent and child at the same
time anyway.

Illumos ZFS issues:
  4046 dsl_dataset_t ds_dir->dd_lock is highly contended
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