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[imcc] fix -O2 used_once: keep side-effecting ops #1036
allow used_once elimination only for purely functional ops without side-effects. Fixes t/compilers/imcc/reg/alloc.t test 2 alligator 2 - r9629 t/compilers/imcc/reg/spill_old.t test 1 bug \#32996 and some more. set ITPUREFUNC in the parser, as this is the best place to find them: logical un_op and null; artithmetic bin_op and assign_op
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