packfile: add install_packed_git_and_mru()

Create a function to install a new packfile into the packed-git
list and add it to the head of the MRU list.

This function will be used in a later commit to install packfiles
created by dynamic object fetching.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

packfile.c

@@ -770,6 +770,12 @@ void install_packed_git(struct repository *r, struct packed_git *pack)
 	hashmap_add(&r->objects->pack_map, &pack->packmap_ent);
 }
 
+void install_packed_git_and_mru(struct repository *r, struct packed_git *pack)
+{
+	install_packed_git(r, pack);
+	list_add(&pack->mru, &r->objects->packed_git_mru);
+}
+
 void (*report_garbage)(unsigned seen_bits, const char *path);
 
 static void report_helper(const struct string_list *list,

packfile.h

@@ -67,6 +67,7 @@ extern void (*report_garbage)(unsigned seen_bits, const char *path);
 
 void reprepare_packed_git(struct repository *r);
 void install_packed_git(struct repository *r, struct packed_git *pack);
+void install_packed_git_and_mru(struct repository *r, struct packed_git *pack);
 
 struct packed_git *get_packed_git(struct repository *r);
 struct list_head *get_packed_git_mru(struct repository *r);