Make the order of the header file includes consistent in backend modules.

Similar to commits 7e73503 and dddf4cd, this commit makes the order
of header file inclusion consistent for backend modules.

In the passing, removed a couple of duplicate inclusions.

Author: Vignesh C
Reviewed-by: Kuntal Ghosh and Amit Kapila
Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com

Author: Amit Kapila

src/backend/access/brin/brin_minmax.c

@@ -10,19 +10,18 @@
  */
 #include "postgres.h"
 
-#include "access/genam.h"
 #include "access/brin_internal.h"
 #include "access/brin_tuple.h"
+#include "access/genam.h"
 #include "access/stratnum.h"
-#include "catalog/pg_type.h"
 #include "catalog/pg_amop.h"
+#include "catalog/pg_type.h"
 #include "utils/builtins.h"
 #include "utils/datum.h"
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/syscache.h"
 
-
 typedef struct MinmaxOpaque
 {
 	Oid			cached_subtype;

src/backend/access/brin/brin_pageops.c

@@ -10,8 +10,8 @@
  */
 #include "postgres.h"
 
-#include "access/brin_pageops.h"
 #include "access/brin_page.h"
+#include "access/brin_pageops.h"
 #include "access/brin_revmap.h"
 #include "access/brin_xlog.h"
 #include "access/xloginsert.h"
@@ -22,7 +22,6 @@
 #include "storage/smgr.h"
 #include "utils/rel.h"
 
-
 /*
  * Maximum size of an entry in a BRIN_PAGETYPE_REGULAR page.  We can tolerate
  * a single item per page, unlike other index AMs.

src/backend/access/brin/brin_tuple.c

@@ -31,14 +31,13 @@
  */
 #include "postgres.h"
 
-#include "access/htup_details.h"
 #include "access/brin_tuple.h"
+#include "access/htup_details.h"
 #include "access/tupdesc.h"
 #include "access/tupmacs.h"
 #include "utils/datum.h"
 #include "utils/memutils.h"
 
-
 static inline void brin_deconstruct_tuple(BrinDesc *brdesc,
 										  char *tp, bits8 *nullbits, bool nulls,
 										  Datum *values, bool *allnulls, bool *hasnulls);

src/backend/access/brin/brin_validate.c

@@ -22,9 +22,8 @@
 #include "catalog/pg_opfamily.h"
 #include "catalog/pg_type.h"
 #include "utils/builtins.h"
-#include "utils/syscache.h"
 #include "utils/regproc.h"
-
+#include "utils/syscache.h"
 
 /*
  * Validator for a BRIN opclass.

src/backend/access/gin/ginbtree.c

@@ -17,8 +17,8 @@
 #include "access/gin_private.h"
 #include "access/ginxlog.h"
 #include "access/xloginsert.h"
-#include "storage/predicate.h"
 #include "miscadmin.h"
+#include "storage/predicate.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
 

src/backend/access/gin/ginfast.c

@@ -20,19 +20,19 @@
 
 #include "access/gin_private.h"
 #include "access/ginxlog.h"
-#include "access/xloginsert.h"
 #include "access/xlog.h"
-#include "commands/vacuum.h"
+#include "access/xloginsert.h"
 #include "catalog/pg_am.h"
+#include "commands/vacuum.h"
 #include "miscadmin.h"
-#include "utils/memutils.h"
-#include "utils/rel.h"
-#include "utils/acl.h"
 #include "postmaster/autovacuum.h"
 #include "storage/indexfsm.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
+#include "utils/acl.h"
 #include "utils/builtins.h"
+#include "utils/memutils.h"
+#include "utils/rel.h"
 
 /* GUC parameter */
 int			gin_pending_list_limit = 0;

src/backend/access/gin/gininsert.c

@@ -16,18 +16,17 @@
 
 #include "access/gin_private.h"
 #include "access/ginxlog.h"
-#include "access/xloginsert.h"
 #include "access/tableam.h"
+#include "access/xloginsert.h"
 #include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/bufmgr.h"
-#include "storage/smgr.h"
 #include "storage/indexfsm.h"
 #include "storage/predicate.h"
+#include "storage/smgr.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
 
-
 typedef struct
 {
 	GinState	ginstate;

src/backend/access/gin/ginvalidate.c

@@ -23,9 +23,8 @@
 #include "catalog/pg_type.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
-#include "utils/syscache.h"
 #include "utils/regproc.h"
-
+#include "utils/syscache.h"
 
 /*
  * Validator for a GIN opclass.

src/backend/access/gist/gist.c

@@ -18,15 +18,14 @@
 #include "access/gistscan.h"
 #include "catalog/pg_collation.h"
 #include "miscadmin.h"
+#include "nodes/execnodes.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
-#include "nodes/execnodes.h"
 #include "utils/builtins.h"
 #include "utils/index_selfuncs.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
 
-
 /* non-export function prototypes */
 static void gistfixsplit(GISTInsertState *state, GISTSTATE *giststate);
 static bool gistinserttuple(GISTInsertState *state, GISTInsertStack *stack,

src/backend/access/gist/gistget.c

@@ -17,11 +17,11 @@
 #include "access/genam.h"
 #include "access/gist_private.h"
 #include "access/relscan.h"
+#include "lib/pairingheap.h"
 #include "miscadmin.h"
+#include "pgstat.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
-#include "pgstat.h"
-#include "lib/pairingheap.h"
 #include "utils/float.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"