The nightly scan showed the loop refactors fix the false positives for
std::vector but not for std::list/std::set, which Infer has no precise
model for. Re-add targeted @infer-ignore comments at the five surviving
sites (threadpool.h, we_chunkmanager.cpp x2, we_dctnry.cpp,
lbidresourcegraph.cpp), keeping the refactored loops.
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