[Differential] [Request, 8 lines] D1382: remove duplicate Declaration entry for DUChainUtils::getOverriders(...) and DUChainUtils::getInheriters(...)

[zhanghuijie (Zhang HuiJie)]

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REVISION SUMMARY
  The current impl of DUChainUtils::getOverriders(...) and DUChainUtils::getInheriters(...) may return some duplicate items in some case. This can be seen while we open the class browser or use the declaration navigation.

REPOSITORY
  rKDEVPLATFORM KDevPlatform

REVISION DETAIL
  https://phabricator.kde.org/D1382

AFFECTED FILES
  language/duchain/navigation/abstractdeclarationnavigationcontext.cpp
  language/duchain/navigation/usescollector.cpp
  plugins/classbrowser/classmodelnode.cpp

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To: zhanghuijie, KDevelop, kfunk
Cc: kdevelop-devel, KDevelop, surgenight, arrowdodger