[kaffe] Weak references/Class destruction

[Guilhem Lavaux]

Hi,

Here is a patch which changes the way the classes are destroyed and 
implements
weak references for boehm-gc and kaffe-gc. This fixes class concurrent
destruction issues which was bugging boehm-gc (and maybe also kaffe-gc) and
should insure that we do not access already freed memory.

There are some drawbacks:
* creating a weak reference is slow and consumes memory.
* walking a class takes more time as you have to decide whether to mark 
or not some memory.

Advantages:
* boehm-gc should work now (even if some bugs might still lurk around 
the structure is in place).
* Relieve the VM from caring about some pointers shared between several 
classes (like interface implementors).
* The patch does not touch the class structure.

It seems that I've still a failure from time to time in ClassGC when 
using the boehm-gc. We will have check this.

Here is the patch. If nobody rejects it I'll check it in tomorrow.

Regards,

Guilhem Lavaux.
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