cache.h: remove unused "the_index" compat macros

The "active_alloc" macro added in 228e94f (Move index-related
variables into a structure., 2007-04-01) has not been used since
4aab5b4 (Make read-cache.c "the_index" free., 2007-04-01). Let's
remove it.

The rest of these are likewise unused, so let's not keep them
around. E.g. 12cd0bf (dir: stop using the index compatibility
macros, 2017-05-05) is the last use of "cache_dir_exists".

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

cache.h

@@ -438,7 +438,6 @@ extern struct index_state the_index;
 
 #define active_cache (the_index.cache)
 #define active_nr (the_index.cache_nr)
-#define active_alloc (the_index.cache_alloc)
 #define active_cache_changed (the_index.cache_changed)
 #define active_cache_tree (the_index.cache_tree)
 
@@ -452,7 +451,6 @@ extern struct index_state the_index;
 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
-#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
@@ -461,13 +459,10 @@ extern struct index_state the_index;
 #define refresh_and_write_cache(refresh_flags, write_flags, gentle) repo_refresh_and_write_index(the_repository, (refresh_flags), (write_flags), (gentle), NULL, NULL, NULL)
 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
-#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
 #define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
-#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
-#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz))
 #define hold_locked_index(lock_file, flags) repo_hold_locked_index(the_repository, (lock_file), (flags))
 #endif