Move "hot" members of PGPROC into a separate PGXACT array.

This speeds up snapshot-taking and reduces ProcArrayLock contention.
Also, the PGPROC (and PGXACT) structures used by two-phase commit are
now allocated as part of the main array, rather than in a separate
array, and we keep ProcArray sorted in pointer order.  These changes
are intended to minimize the number of cache lines that must be pulled
in to take a snapshot, and testing shows a substantial increase in
performance on both read and write workloads at high concurrencies.

Pavan Deolasee, Heikki Linnakangas, Robert Haas

src/backend/replication/walsender.c

@@ -702,7 +702,7 @@ ProcessStandbyHSFeedbackMessage(void)
 	 * safe, and if we're moving it backwards, well, the data is at risk
 	 * already since a VACUUM could have just finished calling GetOldestXmin.)
 	 */
-	MyProc->xmin = reply.xmin;
+	MyPgXact->xmin = reply.xmin;
 }
 
 /* Main loop of walsender process */