Move src/backend/utils/hash/hashfn.c to src/common

This also involves renaming src/include/utils/hashutils.h, which
becomes src/include/common/hashfn.h. Perhaps an argument can be
made for keeping the hashutils.h name, but it seemed more
consistent to make it match the name of the file, and also more
descriptive of what is actually going on here.

Patch by me, reviewed by Suraj Kharage and Mark Dilger. Off-list
advice on how not to break the Windows build from Davinder Singh
and Amit Kapila.

Discussion: http://postgr.es/m/CA+TgmoaRiG4TXND8QuM6JXFRkM_1wL2ZNhzaUKsuec9-4yrkgw@mail.gmail.com

Author: robertmhaas

contrib/citext/citext.c

@@ -4,9 +4,9 @@
 #include "postgres.h"
 
 #include "catalog/pg_collation.h"
+#include "common/hashfn.h"
 #include "utils/builtins.h"
 #include "utils/formatting.h"
-#include "utils/hashutils.h"
 #include "utils/varlena.h"
 
 PG_MODULE_MAGIC;

contrib/hstore/hstore_op.c

@@ -5,10 +5,10 @@
 
 #include "access/htup_details.h"
 #include "catalog/pg_type.h"
+#include "common/hashfn.h"
 #include "funcapi.h"
 #include "hstore.h"
 #include "utils/builtins.h"
-#include "utils/hashutils.h"
 #include "utils/memutils.h"
 
 /* old names for C functions */

contrib/pg_stat_statements/pg_stat_statements.c

@@ -62,6 +62,7 @@
 #include <unistd.h>
 
 #include "catalog/pg_authid.h"
+#include "common/hashfn.h"
 #include "executor/instrument.h"
 #include "funcapi.h"
 #include "mb/pg_wchar.h"
@@ -77,7 +78,6 @@
 #include "tcop/utility.h"
 #include "utils/acl.h"
 #include "utils/builtins.h"
-#include "utils/hashutils.h"
 #include "utils/memutils.h"
 
 PG_MODULE_MAGIC;

contrib/sepgsql/uavc.c

@@ -14,10 +14,10 @@
 
 #include "catalog/pg_proc.h"
 #include "commands/seclabel.h"
+#include "common/hashfn.h"
 #include "sepgsql.h"
 #include "storage/ipc.h"
 #include "utils/guc.h"
-#include "utils/hashutils.h"
 #include "utils/memutils.h"
 
 /*

src/backend/access/common/tupdesc.c

@@ -23,12 +23,12 @@
 #include "access/tupdesc_details.h"
 #include "catalog/pg_collation.h"
 #include "catalog/pg_type.h"
+#include "common/hashfn.h"
 #include "miscadmin.h"
 #include "parser/parse_type.h"
 #include "utils/acl.h"
 #include "utils/builtins.h"
 #include "utils/datum.h"
-#include "utils/hashutils.h"
 #include "utils/resowner_private.h"
 #include "utils/syscache.h"
 

src/backend/access/hash/hashfunc.c

@@ -28,8 +28,8 @@
 
 #include "access/hash.h"
 #include "catalog/pg_collation.h"
+#include "common/hashfn.h"
 #include "utils/builtins.h"
-#include "utils/hashutils.h"
 #include "utils/pg_locale.h"
 
 /*

src/backend/access/tablesample/bernoulli.c

@@ -28,9 +28,9 @@
 
 #include "access/tsmapi.h"
 #include "catalog/pg_type.h"
+#include "common/hashfn.h"
 #include "optimizer/optimizer.h"
 #include "utils/builtins.h"
-#include "utils/hashutils.h"
 
 
 /* Private state */

src/backend/access/tablesample/system.c

@@ -29,9 +29,9 @@
 #include "access/relscan.h"
 #include "access/tsmapi.h"
 #include "catalog/pg_type.h"
+#include "common/hashfn.h"
 #include "optimizer/optimizer.h"
 #include "utils/builtins.h"
-#include "utils/hashutils.h"
 
 
 /* Private state */

src/backend/commands/async.c

@@ -126,6 +126,7 @@
 #include "access/xact.h"
 #include "catalog/pg_database.h"
 #include "commands/async.h"
+#include "common/hashfn.h"
 #include "funcapi.h"
 #include "libpq/libpq.h"
 #include "libpq/pqformat.h"
@@ -138,7 +139,6 @@
 #include "storage/sinval.h"
 #include "tcop/tcopprot.h"
 #include "utils/builtins.h"
-#include "utils/hashutils.h"
 #include "utils/memutils.h"
 #include "utils/ps_status.h"
 #include "utils/snapmgr.h"

src/backend/executor/execGrouping.c

@@ -19,9 +19,9 @@
 #include "postgres.h"
 
 #include "access/parallel.h"
+#include "common/hashfn.h"
 #include "executor/executor.h"
 #include "miscadmin.h"
-#include "utils/hashutils.h"
 #include "utils/lsyscache.h"
 #include "utils/memutils.h"