[IronPython] IronPython 2.6 CodePlex Source Update

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MODIFIED SOURCES
	$/IronPython/IronPython_Main/Languages/IronPython/IronPython/Runtime/ConstantDictionaryStorage.cs
	$/IronPython/IronPython_Main/Languages/IronPython/IronPython/Runtime/EmptyDictionaryStorage.cs

CHECKIN COMMENTS
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Changeset Id: 1762315
Date: 5/4/2010 10:58:00 AM

Fix perf regression related to keyword dictionary calls w/ constant and empty dictionary storages.  Forwards Clone/HasNonStringAttributes for CommonDictionaryStorage, returns appropriate constants for EmptyDictionaryStorage.





(Shelveset: FixKwCallRegression2;REDMOND\dinov | SNAP CheckinId: 10720)