pgsql: Move hash_any prototype from access/hash.h to utils/hashutils.h

Move hash_any prototype from access/hash.h to utils/hashutils.h

... as well as its implementation from backend/access/hash/hashfunc.c to
backend/utils/hash/hashfn.c.

access/hash is the place for the hash index AM, not really appropriate
for generic facilities, which is what hash_any is; having things the old
way meant that anything using hash_any had to include the AM's include
file, pointlessly polluting its namespace with unrelated, unnecessary
cruft.

Also move the HTEqual strategy number to access/stratnum.h from
access/hash.h.

To avoid breaking third-party extension code, add an #include
"utils/hashutils.h" to access/hash.h.  (An easily removed line by
committers who enjoy their asbestos suits to protect them from angry
extension authors.)

Discussion: https://postgr.es/m/201901251935.ser5e4h6djt2@alvherre.pgsql

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/af38498d4c9b840e0e454574519459edda3871db

Modified Files
--------------
contrib/citext/citext.c                         |   2 +-
contrib/hstore/hstore_op.c                      |   2 +-
contrib/pg_stat_statements/pg_stat_statements.c |   2 +-
contrib/sepgsql/uavc.c                          |   2 +-
src/backend/access/common/tupdesc.c             |   1 -
src/backend/access/hash/hashfunc.c              | 627 +----------------------
src/backend/access/tablesample/bernoulli.c      |   2 +-
src/backend/access/tablesample/system.c         |   2 +-
src/backend/catalog/pg_publication.c            |   1 -
src/backend/commands/publicationcmds.c          |   1 -
src/backend/executor/execGrouping.c             |   1 -
src/backend/executor/nodeSamplescan.c           |   2 +-
src/backend/lib/bloomfilter.c                   |   2 +-
src/backend/nodes/bitmapset.c                   |   3 +-
src/backend/storage/file/sharedfileset.c        |   4 +-
src/backend/tsearch/ts_typanalyze.c             |   2 +-
src/backend/utils/adt/acl.c                     |   2 +-
src/backend/utils/adt/arrayfuncs.c              |   1 -
src/backend/utils/adt/date.c                    |   2 +-
src/backend/utils/adt/jsonb_gin.c               |   2 +-
src/backend/utils/adt/jsonb_util.c              |   2 +-
src/backend/utils/adt/mac.c                     |   2 +-
src/backend/utils/adt/mac8.c                    |   2 +-
src/backend/utils/adt/network.c                 |   3 +-
src/backend/utils/adt/numeric.c                 |   2 +-
src/backend/utils/adt/pg_lsn.c                  |   1 -
src/backend/utils/adt/rangetypes.c              |   3 +-
src/backend/utils/adt/tid.c                     |   2 +-
src/backend/utils/adt/timestamp.c               |   1 -
src/backend/utils/adt/uuid.c                    |   2 +-
src/backend/utils/adt/varchar.c                 |   3 +-
src/backend/utils/adt/varlena.c                 |   2 +-
src/backend/utils/cache/catcache.c              |   1 -
src/backend/utils/cache/relcache.c              |   1 -
src/backend/utils/hash/hashfn.c                 | 632 +++++++++++++++++++++++-
src/backend/utils/resowner/resowner.c           |   3 +-
src/backend/utils/sort/tuplesort.c              |   2 +-
src/include/access/hash.h                       |  24 +-
src/include/access/stratnum.h                   |   7 +
src/include/utils/hashutils.h                   |  19 +
40 files changed, 690 insertions(+), 687 deletions(-)