Add 'Arena::get_mut_gc' api to allow mutating a Gc
#108
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This method takes
&mut self
, so it can only be used outside of amutate
/mutate_root
call.This is useful when an application (e.g. Ruffle) almost always read from a particular
Gc
, and occasionally need to write. If modifying theGc
can be done outside of amutate
call, then this API can be used to avoid introducing aGcCell