[SimplifyCFG] Shrink integer lookup tables (#202071) After #200664, we generate lookup tables in more cases, leading to higher memory use and larger binaries. Partially alleviate this by shrinking the lookup tables if all elements are small integers. The underlying idea is that an extra integer extension can typically be folded into a load instruction at no extra cost. This reduces the size of stage2-clang by 0.13%.
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