[perl #48190] [TODO] [amber] Can null variable check be reinstated by generating n_neg instead of neg?

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# New Ticket Created by  Paul Cochrane 
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In languages/amber/lib/kernel/pmc/amber_integer.pmc:neg() there is the todo
item:

/* if (!dest)  --TODO: can we reinstate this if we generate n_neg instead of 
neg? */

So, can the check to see if dest is NULL be reinstated if n_neg is generated
instead of neg?  Work out if this is the case, implement if so, delete the 
line contating the TODO item if not.