Jordan Rose 985cbb8b2a Dependencies: Add new options to qualified lookup for known dependencies. ...

Specifically, a qualified lookup can now be treated as:
- a known private dependency, which does not affect downstream files
- a known non-private dependency, which may affect downstream files
- a known non-dependency
- unknown, which means the compiler will try to infer whether it's a
  private dependency from the context

This commit also includes some obvious uses of the new flags, but nothing
actually too interesting yet; there shouldn't be any observable behavior
change here in normal user code.

Swift SVN r23483

2014-11-20 20:58:17 +00:00

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