[kaffe] Weak references/Class destruction

[Guilhem Lavaux]

Hi,

Here is the final implementation (before commit). I have 0 regressions 
on my laptop. BTW, I've removed
one or two mutex protections which looks like causing a deadlock in 
glibc when the world is suspended.
I do not yet understand how this can be caused but removing them 
suppresses the deadlocks and
GCTest passes everytime I've run it here (for the time being). We'll 
need to clear this up to check whether
it is really a glibc bug.

Adam, could you try it on your real SMP ?

Cheers,

Guilhem Lavaux.
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