Merge branch 'jk/fetch-quick-tag-following' into maint

When fetching from a remote that has many tags that are irrelevant
to branches we are following, we used to waste way too many cycles
when checking if the object pointed at by a tag (that we are not
going to fetch!) exists in our repository too carefully.

* jk/fetch-quick-tag-following:
  fetch: use "quick" has_sha1_file for tag following

cache.h

@@ -1123,6 +1123,7 @@ static inline int has_sha1_file(const unsigned char *sha1)
 
 /* Same as the above, except for struct object_id. */
 extern int has_object_file(const struct object_id *oid);
+extern int has_object_file_with_flags(const struct object_id *oid, int flags);
 
 /*
  * Return true iff an alternate object database has a loose object