mark_common() in negotiator/default.c may overflow the stack due to
recursive function calls. Avoid this by instead recursing using a
heap-allocated data structure.

This is the same case as [1].

1. https://lore.kernel.org/git/20221025232934.1504445-1-jonathantanmy@google.com/

Reported-by: Xin Xing <xingxin.xx@bytedance.com>
Signed-off-by: Han Xin <hanxin.hx@bytedance.com>