Ashley Garland d6e49a98db [SymbolGraph] Put extending declarations in rootmost module ...

When extending another module's type in your module, serialize declarations in
the extension into the other module's "extension" symbol graph file, including
relationships. This mechanic should continue up to the rootmost module. For
example:

A.AStruct <- B.BStruct < C.CStruct

Both BStruct and CStruct should go in `@A` symbol graph files because AStruct
owns BStruct and by extension owns CStruct. This is reflected in
documentation curation in some form already.

rdar://60796811

2020-04-07 15:41:59 -07:00

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