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- Use a DenseSet instead of a FoldingSet to cache canonicalized nodes. This reduces the overhead of double-hashing. - Use reference counts in ImutAVLTree to much more aggressively recover tree nodes that are no longer usable. We can generate many transient nodes while using add() and remove() on ImmutableSet/ImmutableMaps to generate a final set/map. For the clang static analyzer (the main client of these data structures), this results in a slight speedup (0.5%) when analyzing sqlite3, but much more importantly results in a 30-60% reduction in peak memory usage when the analyzer is analyzing a given function in a file. On average that's about a ** 44% reduction ** in the memory footprint of the static analyzer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120459 91177308-0d34-0410-b5e6-96231b3b80d8
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