commit-reach: avoid is_descendant_of() shim

d91d6fbf26 (commit-reach: create repo_is_descendant_of(), 2020-06-17)
adds a repository aware version of is_descendant_of() and a backward
compatibility shim that is barely used.

Update all callers to directly use the new repo_is_descendant_of()
function instead; making the codebase simpler and pushing more
the_repository references higher up the stack.

Helped-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/commit-reach.h b/commit-reach.h
index 99a43e8..b49ad71 100644
--- a/commit-reach.h
+++ b/commit-reach.h
@@ -27,7 +27,9 @@ struct commit_list *repo_get_merge_bases_many_dirty(struct repository *r,
 
 struct commit_list *get_octopus_merge_bases(struct commit_list *in);
 
-int is_descendant_of(struct commit *commit, struct commit_list *with_commit);
+int repo_is_descendant_of(struct repository *r,
+			  struct commit *commit,
+			  struct commit_list *with_commit);
 int repo_in_merge_bases(struct repository *r,
 			struct commit *commit,
 			struct commit *reference);