Alphabetically order reference to include files, "G" - "M".

contrib/intagg/int_aggregate.c

contrib/lo/lo.c

src/backend/access/common/indextuple.c

src/backend/access/gin/ginarrayproc.c

src/backend/access/gin/ginvacuum.c

src/backend/access/gist/gistget.c

src/backend/access/gist/gistvacuum.c

src/backend/access/transam/multixact.c

src/backend/catalog/heap.c

src/backend/commands/indexcmds.c

src/backend/optimizer/plan/initsplan.c

src/backend/utils/mb/mbutils.c

src/backend/utils/misc/guc.c

src/include/access/gist_private.h