send-pack.c: add config push.useBitmaps

Reachability bitmaps are designed to speed up the "counting objects"
phase of generating a pack during a clone or fetch. They are not
optimized for Git clients sending a small topic branch via "git push".
In some cases (see [1]), using reachability bitmaps during "git push"
can cause significant performance regressions.

Add a new "push.useBitmaps" configuration variable to allow users to
tell "git push" not to use bitmaps. We already have "pack.bitmaps"
that controls the use of bitmaps, but a separate configuration variable
allows the reachability bitmaps to still be used in other areas,
such as "git upload-pack", while disabling it only for "git push".

[1]: https://lore.kernel.org/git/87zhoz8b9o.fsf@evledraar.gmail.com/

Signed-off-by: Kyle Zhao <kylezhao@tencent.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

send-pack.h

@@ -26,7 +26,8 @@ struct send_pack_args {
 		/* One of the SEND_PACK_PUSH_CERT_* constants. */
 		push_cert:2,
 		stateless_rpc:1,
-		atomic:1;
+		atomic:1,
+		disable_bitmaps:1;
 	const struct string_list *push_options;
 };