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Unroll loop if possible.
struct UnrollWalker ;
||Walk e in execution order, fixing it according to state. state == 0: when rdinc is found, remove it, advance to state 1 state == 1: continue, replacing instances of v with v+increment, when second rdinc is found, advance to state 2 state == 2: continue|
|l||loop to unroll|
true if loop was unrolled