Review Request: Shared empty private class for KTimeZoneBackend

[Volker Krause]

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http://git.reviewboard.kde.org/r/101593/
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Review request for kdelibs, John Layt and David Jarvie.


Summary
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This patch makes KTimeZoneBackend use a shared empty private class, an optimization done in a few other places around KDateTime already.

This specific place turned up during memory-profiling KMail with folders containing ~100k messages. KMail (via KMime) creates one KDateTime object per message (using OffsetFromUTC mode), each of which contains two (empty) KTimeZone objects. The resulting 200k (identical) KTimeZoneBackend objects use about 20Mb of heap memory according to massif.


Diffs
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  kdecore/date/ktimezone.cpp f38deed 

Diff: http://git.reviewboard.kde.org/r/101593/diff


Testing
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kdecore unit tests still pass, KMail also still works fine, but I have no idea if this has side-effects on other, more complex use-cases


Thanks,

Volker

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