Rintaro Ishizaki af27e8f183 [CodeCompletion] Avoid suggesting duplicated module names ...

in global completion result. Overly modules have the same name as the
shadowed modules. We should not list both names because they are
identical.

Maintain a set of seen module names to avoid suggesting duplicated
names.

rdar://problem/63370253

2020-05-19 15:18:34 -07:00

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