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ChunkedBitSetis good at avoiding excessive memory usage for programs with very large functgions where dataflow bitsets have very large domain sizes. But it's overly heavyweight for small bitsets, because any non-emptyChunkedBitSettakes up at least 256 bytes.This PR introduces
MixedBitSet, which is a simple bitset that usesBitSetfor small/medium bitsets andChunkedBitSetfor large bitsets. It's a speed and memory usage win.r? @Mark-Simulacrum