pgsql: Improve gist XLOG code to follow the coding rules needed to - Mailing list pgsql-committers

Log Message:
-----------
Improve gist XLOG code to follow the coding rules needed to prevent
torn-page problems.  This introduces some issues of its own, mainly
that there are now some critical sections of unreasonably broad scope,
but it's a step forward anyway.  Further cleanup will require some
code refactoring that I'd prefer to get Oleg and Teodor involved in.

Modified Files:
--------------
    pgsql/src/backend/access/gist:
        gist.c (r1.129 -> r1.130)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gist.c.diff?r1=1.129&r2=1.130)
        gistvacuum.c (r1.16 -> r1.17)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistvacuum.c.diff?r1=1.16&r2=1.17)
        gistxlog.c (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistxlog.c.diff?r1=1.12&r2=1.13)
    pgsql/src/include/access:
        gist_private.h (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/gist_private.h.diff?r1=1.11&r2=1.12)