[kaffe] sanityCheck disabling...

[Jukka Santala]

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Kaffe's register-slot sanity checking code is a significant CPU-eater.
Since I've never seen this sanity-check catch anything, I think for
standard builds it ought to be safe to simply disable it, and get
relatively significant performance-boost for cery little effort. Debug
builds probably ought to have it enabled, so maybe there's room to hook it
into some configure script parameters yet.

 -Jukka Santala

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