Xi Ge d0e176810f [Serialization] Serialize doc comments for extensions. Need this for rdar://25157796 ...

We did not serialize them because getting USR for extensions is tricky (USRs are
usually for value decls). This commit starts to make up an USR for an extension by combining
the extended nominal's USR with the USR of the first value member of the extension. We use
this made-up USR to associate doc comments when (de)serializing them.

2016-03-15 13:35:07 -07:00

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