PATCH: private ivars - update for r176116

[jahanian]

Not commenting on the DebugInfo caching part. But as a general comment, if there was a performance hit, you may want to
provide performance numbers before and after this patch, say on Cocoa.h, and sample of other more modern framework
files which use if private ivars (and of course while generating debug info).

- Fariborz

On Feb 26, 2013, at 6:08 PM, Adrian Prantl <aprantl at apple.com> wrote:

> 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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