hash-ll.h: split out of hash.h to remove dependency on repository.h

hash.h depends upon and includes repository.h, due to the definition and
use of the_hash_algo (defined as the_repository->hash_algo).  However,
most headers trying to include hash.h are only interested in the layout
of the structs like object_id.  Move the parts of hash.h that do not
depend upon repository.h into a new file hash-ll.h (the "low level"
parts of hash.h), and adjust other files to use this new header where
the convenience inline functions aren't needed.

This allows hash.h and object.h to be fairly small, minimal headers.  It
also exposes a lot of hidden dependencies on both path.h (which was
brought in by repository.h) and repository.h (which was previously
implicitly brought in by object.h), so also adjust other files to be
more explicit about what they depend upon.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/helper/test-bloom.c

@@ -2,6 +2,7 @@
 #include "bloom.h"
 #include "hex.h"
 #include "commit.h"
+#include "repository.h"
 #include "setup.h"
 
 static struct bloom_filter_settings settings = DEFAULT_BLOOM_FILTER_SETTINGS;

t/helper/test-cache-tree.c

@@ -6,6 +6,7 @@
 #include "tree.h"
 #include "cache-tree.h"
 #include "parse-options.h"
+#include "repository.h"
 #include "setup.h"
 
 static char const * const test_cache_tree_usage[] = {

t/helper/test-dump-cache-tree.c

@@ -1,9 +1,11 @@
 #define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
 #include "cache.h"
+#include "hash.h"
 #include "hex.h"
 #include "tree.h"
 #include "cache-tree.h"
+#include "repository.h"
 #include "setup.h"
 
 static void dump_one(struct cache_tree *it, const char *pfx, const char *x)

t/helper/test-dump-fsmonitor.c

@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "repository.h"
 #include "setup.h"
 
 int cmd__dump_fsmonitor(int ac, const char **av)

t/helper/test-dump-untracked-cache.c

@@ -3,6 +3,7 @@
 #include "cache.h"
 #include "dir.h"
 #include "hex.h"
+#include "repository.h"
 #include "setup.h"
 
 static int compare_untracked(const void *a_, const void *b_)

t/helper/test-example-decorate.c

@@ -2,6 +2,7 @@
 #include "git-compat-util.h"
 #include "object.h"
 #include "decorate.h"
+#include "repository.h"
 
 int cmd__example_decorate(int argc, const char **argv)
 {

t/helper/test-fsmonitor-client.c

@@ -7,6 +7,7 @@
 #include "cache.h"
 #include "parse-options.h"
 #include "fsmonitor-ipc.h"
+#include "repository.h"
 #include "setup.h"
 #include "thread-utils.h"
 #include "trace2.h"

t/helper/test-lazy-init-name-hash.c

@@ -3,6 +3,7 @@
 #include "cache.h"
 #include "environment.h"
 #include "parse-options.h"
+#include "repository.h"
 #include "setup.h"
 #include "trace.h"
 

t/helper/test-match-trees.c

@@ -3,6 +3,7 @@
 #include "hex.h"
 #include "match-trees.h"
 #include "object-name.h"
+#include "repository.h"
 #include "setup.h"
 #include "tree.h"
 

t/helper/test-oidmap.c

@@ -2,6 +2,7 @@
 #include "hex.h"
 #include "object-name.h"
 #include "oidmap.h"
+#include "repository.h"
 #include "setup.h"
 #include "strbuf.h"
 

t/helper/test-path-utils.c

@@ -2,6 +2,7 @@
 #include "cache.h"
 #include "abspath.h"
 #include "environment.h"
+#include "path.h"
 #include "setup.h"
 #include "string-list.h"
 #include "trace.h"

t/helper/test-read-cache.c

@@ -2,6 +2,7 @@
 #include "test-tool.h"
 #include "cache.h"
 #include "config.h"
+#include "repository.h"
 #include "setup.h"
 #include "wrapper.h"
 

t/helper/test-scrap-cache-tree.c

@@ -2,6 +2,7 @@
 #include "test-tool.h"
 #include "cache.h"
 #include "lockfile.h"
+#include "repository.h"
 #include "setup.h"
 #include "tree.h"
 #include "cache-tree.h"

t/helper/test-submodule-config.c

@@ -1,6 +1,8 @@
 #include "test-tool.h"
 #include "config.h"
+#include "hash.h"
 #include "object-name.h"
+#include "repository.h"
 #include "setup.h"
 #include "submodule-config.h"
 #include "submodule.h"

t/helper/test-submodule-nested-repo-config.c

@@ -1,4 +1,5 @@
 #include "test-tool.h"
+#include "repository.h"
 #include "setup.h"
 #include "submodule-config.h"
 

t/helper/test-submodule.c

@@ -2,6 +2,7 @@
 #include "test-tool-utils.h"
 #include "parse-options.h"
 #include "remote.h"
+#include "repository.h"
 #include "setup.h"
 #include "submodule-config.h"
 #include "submodule.h"

t/helper/test-trace2.c

@@ -3,6 +3,7 @@
 #include "run-command.h"
 #include "exec-cmd.h"
 #include "config.h"
+#include "repository.h"
 #include "trace2.h"
 
 typedef int(fn_unit_test)(int argc, const char **argv);

t/helper/test-write-cache.c

@@ -2,6 +2,7 @@
 #include "test-tool.h"
 #include "cache.h"
 #include "lockfile.h"
+#include "repository.h"
 #include "setup.h"
 
 int cmd__write_cache(int argc, const char **argv)