replace-object: add repository argument to do_lookup_replace_object

Add a repository argument to allow the do_lookup_replace_object caller
to be more specific about which repository to handle. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

replace-object.h

@@ -14,7 +14,8 @@ struct replace_object {
  * This internal function is only declared here for the benefit of
  * lookup_replace_object().  Please do not call it directly.
  */
-extern const struct object_id *do_lookup_replace_object(const struct object_id *oid);
+#define do_lookup_replace_object(r, s) do_lookup_replace_object_##r(s)
+extern const struct object_id *do_lookup_replace_object_the_repository(const struct object_id *oid);
 
 /*
  * If object sha1 should be replaced, return the replacement object's
@@ -28,7 +29,7 @@ static inline const struct object_id *lookup_replace_object(const struct object_
 	    (the_repository->objects->replace_map &&
 	     the_repository->objects->replace_map->map.tablesize == 0))
 		return oid;
-	return do_lookup_replace_object(oid);
+	return do_lookup_replace_object(the_repository, oid);
 }
 
 #endif /* REPLACE_OBJECT_H */

replace_object.c

@@ -55,7 +55,7 @@ static void prepare_replace_object_the_repository(void)
  * permanently-allocated value.  This function always respects replace
  * references, regardless of the value of check_replace_refs.
  */
-const struct object_id *do_lookup_replace_object(const struct object_id *oid)
+const struct object_id *do_lookup_replace_object_the_repository(const struct object_id *oid)
 {
 	int depth = MAXREPLACEDEPTH;
 	const struct object_id *cur = oid;