Patch: _Jv_BuildGCDescr() (fix -findirect-dispatch)

[Bryce McKinlay]

_Jv_BuildGCDescr was generating backwards mark descriptors (first word 
of object should be in most significant bit of descriptor). Also it 
wasn't taking into account the vtable pointer and sync_info fields, 
which should also be marked. This was causing major breakage for code 
compiled with -findirect-dispatch.

I'm checking in this fix.

Regards

Bryce.

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