generateELf: transform list lookup to set lookup

if a in myList -> O(n)
if a in mySet -> O(1) or O(log n) (hash or tree)

Benchmark:

c4f95dc: 615.39s user 22.88s system 97% cpu 10:54.40 total
    ijwmd took 144.227s to complete
    msv took 97.243s to complete
    nep took 139.420s to complete
    ops took 97.525s to complete
    re took 69.696s to complete
    ars took 106.208s to complete

a8f046e: 612.09s user 22.72s system 97% cpu 10:50.48 total
    [...]

6bfc80f: 477.23s user 18.79s system 96% cpu  8:32.24 total
    [...]

9b9c350: 474.62s user 19.02s system 96% cpu  8:29.50 total
    [...]

this:    141.54s user 16.22s system 91% cpu  2:52.92 total
    ijwmd took 29.749s to complete
    msv took 26.796s to complete
    nep took 29.950s to complete
    ops took 25.215s to complete
    re took 28.730s to complete
    ars took 32.406s to complete

(e.g. ijwmd is examples/indirectJmpWithMemoryData.py)
(6x 967 executables, sequential on an i7-3770)