Use PG_GETARG_TRANSACTIONID where appropriate

Peter Eisentraut <peter@eisentraut.org>

Commit: dd26a0ad760b11237d7ea9cda8ccccc1826c2c64
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-11-02T15:48:22Z
Releases: 14.0
Use PG_GETARG_TRANSACTIONID where appropriate

Some places were using PG_GETARG_UINT32 where PG_GETARG_TRANSACTIONID
would be more appropriate.  (Of course, they are the same internally,
so there is no externally visible effect.)  To do that, export
PG_GETARG_TRANSACTIONID outside of xid.c.  We also export
PG_RETURN_TRANSACTIONID for symmetry, even though there are currently
no external users.

Author: Ashutosh Bapat <ashutosh.bapat@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/d8f6bdd536df403b9b33816e9f7e0b9d@G08CNEXMBPEKD05.g08.fujitsu.local

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