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def_arg_reg[0] is used for storage of timeout instruction
when a 'receive after' is executed. When a process was
scheduled out inside prim_eval:'receive'/0 due to a function
call, def_arg_reg[0] was overwritten due to storage of live
registers.
prim_eval:'receive'/2 now calls arg_reg_alloc/0 which
bumps all reductions and then calls arg_reg_alloc/7
which will cause an allocation of a new arg_reg array
since def_arg_reg only can hold 6 values. This ensures
that the timeout instruction in def_arg_reg[0] used
for the timeout wont be overwritten.
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