D11282: less expensive findByUrl in KCoreDirListerCache

[Jaime Torres Amate]

jtamate added a dependency: D12945: kcoredirlister lstItems benchmark.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D11282

To: jtamate, #frameworks, dfaure
Cc: mwolff, michaelh, ngraham, bruns