Thread: pgsql: Replace ReadBuffer to ReadBufferWithStrategy in all

Log Message:
-----------
Replace ReadBuffer to ReadBufferWithStrategy in all vacuum-involved places
to implement limited-size "ring" of buffers for VACUUM for GIN & GIST

Modified Files:
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    pgsql/src/backend/access/gin:
        ginvacuum.c (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gin/ginvacuum.c.diff?r1=1.12&r2=1.13)
    pgsql/src/backend/access/gist:
        gistvacuum.c (r1.29 -> r1.30)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistvacuum.c.diff?r1=1.29&r2=1.30)