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This takes memory usage from 5.1GB to 970MB - it could go further by using a small size of 2 instead of the default of 4, but given the rather high cost of going over this limit by much, I figured a little slosh would be worth the ~130MB of memory usage. & this'll might not be such a big deal if we use a custom slab allocator for the DenseMaps here anyway While the vast majority (99.9%) of records use only 1 entry, the tuning parameter to SmallDenseMap is the the number of buckets, not the number of entries - so a small size of 1 wasn't useful, even for 1 element, it would tip over into allocating (much, 64 slots worth) more space - none of them ended up small. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307608 91177308-0d34-0410-b5e6-96231b3b80d8
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