b296050 qemu: Adjust VM id allocation

Authored and Committed by Erik Skultety 8 years ago
    qemu: Adjust VM id allocation
    
    Our atomic increment (virAtomicIntInc) uses (if available) gcc
    __sync_add_and_fetch builtin. In qemu driver though, we'd profit more
    from __sync_fetch_and_add builtin. To keep it simplistic, this patch
    adjusts qemu driver initialization rather than adding a new atomic
    increment macro.
    
        
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