D9783: Performance: Reuse the global icon loader

[Milian Wolff]

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REVISION SUMMARY
  I just found a noticeable GUI hang when showing a problem widget
  for a missing include path. There, the profiler pointed me at
  KIconLoader which was reconstructed whenever we query for the icon
  representing the severity of a problem.
  
  By reusing the global icon loader, we can get the information from
  the cache which is significantly faster.

REPOSITORY
  R32 KDevelop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9783

AFFECTED FILES
  kdevplatform/language/duchain/navigation/problemnavigationcontext.cpp

To: mwolff, #kdevelop
Cc: kdevelop-devel
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