PATCH: private ivars - update for r176116

[Adrian Prantl]

Hi CFEers,

After re-thinking it, here is an updated version of this patch that does not completely disable caching for incomplete interfaces. This should minimize the performance hit of the previous version.
Basically I am now storing ObjCInterface-Types in a separate cache, together with a “checksum” (really the number of ivars). If we look up the type again, I see if the checksum changed and otherwise just return the type from the cache.

-- Adrian

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