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By moving a disjunct outside the scope of an `exists(Function f`
variable it doens't use, the code becomes clearer and can be optimized
better.
The CP in the QL code did not lead to a CP at evaluation time since the
optimizer was smart enough to compensate for it:
376161 ~37597630% {0} r1 = SCAN functions OUTPUT {}
1 ~0% {0} r2 = STREAM DEDUP r1
Before this change, the largest tuple count in `leakedInSameMethod` on
bitcoin/bitcoin was 2M. Now it's 400k.