[kaffe] Moving gcRefs.[ch]

[Guilhem Lavaux]

Hi,

I'm currently removing all kaffe-gc specific code from the core VM and 
putting it into kaffe-gc. This implies that we don't need anymore 
walkMemory and walkObject. These GC calls were specific to kaffe-gc. The 
reference marking will be moved directly into kaffe-gc and I'll write an 
equivalent for the boehm-gc.

To inform the GC of Thread objects, I'll have to transform some atomic 
malloc calls into non atomic malloc calls. This will force the GC to 
walk the complete thread contexts and to look for new objects inside it.

Afterwards, I may also be able to implement soft references in both GC. 
And so two new JNI calls. :)

Cheers,

Guilhem.