Remove volatile qualifiers from dynahash.c, shmem.c, and sinvaladt.c

Robert Haas <rhaas@postgresql.org>

Commit: 430008b5a7ac395ab3057377104148e80718045c
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-10-16T18:14:15Z
Releases: 9.6.0
Remove volatile qualifiers from dynahash.c, shmem.c, and sinvaladt.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.

Thomas Munro

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