[cfe-dev] [libc++] Patch to support forward_list<Incomplete Type>

[Zhihao Yuan]

Hi,

libc++'s forward_list already distinguished the sentry node from data node,
so this patch is just trivial: use an external traits to get the begin node type
instead of looking at data node's implementation to find it.

-- 
Zhihao Yuan, ID lichray
The best way to predict the future is to invent it.
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