Remove volatile qualifiers from bufmgr.c and freelist.c

Robert Haas <rhaas@postgresql.org>

Commit: e93b62985f9c69dcb6f0747450809fff64b78a6e
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-11-16T23:50:06Z
Releases: 9.6.0
Remove volatile qualifiers from bufmgr.c and freelist.c

Prior to commit 0709b7ee72e4bc71ad07b7120acd117265ab51d0, access to
variables within a spinlock-protected critical section had to be done
through a volatile pointer, but that should no longer be necessary.

Review by Andres Freund

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