Remove more volatile qualifiers.

Robert Haas <rhaas@postgresql.org>

Commit: 8f6bb851bdb75d741b3a7543bbf681e3cd7e65dc
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-10-06T19:45:02Z
Releases: 9.6.0
Remove more volatile qualifiers.

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.
This continues work begun in df4077cda2eae3eb4a5cf387da0c1e7616e73204
and 6ba4ecbf477e0b25dd7bde1b0c4e07fc2da19348.

Thomas Munro and Michael Paquier

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