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intsets.Sparse is a sparse bit vector. It uses space proportional to the number of elements, not the maximum element (as is the case for a dense bit vector). A forthcoming CL will make use of it in go/pointer, where it reduces solve time by 78%. A similar representation is used for Andersen's analysis in gcc and LLVM. + Tests. LGTM=sameer, crawshaw, gri R=gri CC=crawshaw, golang-codereviews, sameer https://golang.org/cl/10837043