Move partition_tuple_slot out of EState.

Robert Haas <rhaas@postgresql.org>

Commit: 345b2dcf070bd8fbccde643b1b2856027623e9e5
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-01-04T18:16:59Z
Releases: 10.0
Move partition_tuple_slot out of EState.

Commit 2ac3ef7a01df859c62d0a02333b646d65eaec5ff added a TupleTapleSlot
for partition tuple slot to EState (es_partition_tuple_slot) but it's
more logical to have it as part of ModifyTableState
(mt_partition_tuple_slot) and CopyState (partition_tuple_slot).

Discussion: http://postgr.es/m/1bd459d9-4c0c-197a-346e-e5e59e217d97@lab.ntt.co.jp

Amit Langote, per a gripe from me

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