On the log-addressing branch:
Use / clean iterpools consistent with our standard pool usage pattern.

* subversion/libsvn_fs_fs/cached_data.c
  (block_read): clean iterpool at loop start

* subversion/libsvn_fs_fs/index.c
  (svn_fs_fs__l2p_index_create,
   prefetch_l2p_pages,
   l2p_index_lookup,
   svn_fs_fs__p2l_index_create,
   p2l_index_lookup): ditto

* subversion/libsvn_fs_fs/recovery.c
  (recover_get_largest_revision): same here, ...

* subversion/libsvn_fs_fs/revprops.c
  (svn_fs_fs__upgrade_pack_revprops,
   parse_packed_revprops,
   read_pack_revprop,
   switch_to_new_revprop,
   serialize_revprops_header,
   svn_fs_fs__delete_revprops_shard): ... here, ...

* subversion/libsvn_fs_fs/verify.c
  (compare_l2p_to_p2l_index,
   compare_p2l_to_l2p_index,
   compare_p2l_to_rev,
   verify_index_consistency): ... here, ...

* subversion/libsvn_fs_fs/pack.c
  (pack_range,
   append_revision,
   pack_log_addressed): ... and here
  (store_items,
   copy_reps_from_temp): clean iterpool after initial skip check


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1533816 13f79535-47bb-0310-9956-ffa450edef68