Migrate replication slot I/O locks into a separate tranche.

Robert Haas <rhaas@postgresql.org>

Commit: 2251179e6ad3a865d2f55e1832fab34608fcce43
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-01-29T14:45:38Z
Releases: 9.6.0
Migrate replication slot I/O locks into a separate tranche.

This is following in a long train of similar changes and for the same
reasons - see b319356f0e94a6482c726cf4af96597c211d8d6e and
fe702a7b3f9f2bc5bf6d173166d7d55226af82c8 inter alia.

Author: Amit Kapila
Reviewed-by: Alexander Korotkov, Robert Haas

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