The new opaque type replaces the previous use of vectors for obarrays.
`obarray-make` now returns objects of this type.  Functions that take
obarrays continue to accept vectors for compatibility, now just using
their first slot to store an actual obarray object.

obarray-size and obarray-default-size now obsolete.

* lisp/obarray.el (obarray-default-size, obarray-size):
Declare obsolete.
(obarray-make, obarrayp, obarray-clear): Remove from here.
* src/fns.c (reduce_emacs_uint_to_hash_hash): Remove from here.
* src/lisp.h (struct Lisp_Obarray, OBARRAYP, XOBARRAY, CHECK_OBARRAY)
(make_lisp_obarray, obarray_size, check_obarray)
(obarray_iter_t, make_obarray_iter, obarray_iter_at_end)
(obarray_iter_step, obarray_iter_symbol, DOOBARRAY, knuth_hash): New.
(reduce_emacs_uint_to_hash_hash): Moved here.
* src/lread.c (check_obarray): Renamed and reworked as...
(checked_obarray_slow): ...this.
(intern_sym, Funintern, oblookup, map_obarray)
(Finternal__obarray_buckets): Adapt to new type.
(obarray_index, allocate_obarray, make_obarray, grow_obarray)
(obarray_default_bits, Fobarray_make, Fobarrayp, Fobarray_clear): New.
* etc/emacs_lldb.py (Lisp_Object):
* lisp/emacs-lisp/cl-macs.el (`(,type . ,pred)):
* lisp/emacs-lisp/cl-preloaded.el (cl--typeof-types):
* lisp/emacs-lisp/comp-common.el (comp-known-type-specifiers):
* lisp/emacs-lisp/comp.el (comp-known-predicates):
* src/alloc.c (cleanup_vector, process_mark_stack):
* src/data.c (Ftype_of, syms_of_data):
* src/minibuf.c (Ftry_completion, Fall_completions, Ftest_completion):
* src/pdumper.c (dump_obarray_buckets, dump_obarray, dump_vectorlike):
* src/print.c (print_vectorlike_unreadable):
* test/lisp/abbrev-tests.el (abbrev-make-abbrev-table-test):
* test/lisp/obarray-tests.el (obarrayp-test)
(obarrayp-unchecked-content-test, obarray-make-default-test)
(obarray-make-with-size-test):
Adapt to new type.

* lisp/obarray.el (obarray-clear): New.
* lisp/abbrev.el (clear-abbrev-table):
* lisp/vc/vc.el (vc-clear-context): Use it instead of assuming the
obarray is a vector that can be 0-filled.
* test/lisp/obarray-tests.el (obarray-clear): New test.

This prepares for the introduction of an actual obarray type.

* lisp/cedet/semantic/lex-spp.el (semantic-lex-spp-dynamic-map)
(semantic-lex-spp-dynamic-map-stack, semantic-lex-make-spp-table):
* lisp/cedet/semantic/lex.el (semantic-lex-make-keyword-table)
(semantic-lex-make-type-table):
* lisp/completion.el (cmpl-prefix-obarray, cmpl-obarray)
(clear-all-completions):
* lisp/emacs-lisp/checkdoc.el (checkdoc-defun-info):
* lisp/emacs-lisp/eldoc.el (eldoc-message-commands)
(eldoc-edit-message-commands):
* lisp/mail/mail-extr.el (mail-extr-all-top-level-domains):
* lisp/mail/rmailkwd.el (rmail-label-obarray):
* lisp/net/dns.el (dns-cache):
* lisp/net/eww.el (eww-suggested-uris):
* lisp/net/imap.el (imap-open, imap-mailbox-select-1)
(imap-message-copyuid-1, imap-message-appenduid-1):
* lisp/obsolete/pgg.el (pgg-passphrase-cache, pgg-pending-timers):
* lisp/play/cookie1.el (cookie-cache):
* lisp/progmodes/cc-defs.el (c-lang-constants, c-define-lang-constant):
* lisp/progmodes/cc-langs.el (c-keywords-obarray):
* lisp/vc/vc-hooks.el (vc-file-prop-obarray):
* test/lisp/obarray-tests.el (obarrayp-test):
* test/src/minibuf-tests.el (minibuf-tests--strings-to-obarray):
Use obarray-make instead of obarray-make.

Run "TZ=UTC0 admin/update-copyright".

Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

Run 'TZ=UTC0 admin/update-copyright $(git ls-files)'.

Run admin/update-copyright.