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This assumes that a) finding the bucket containing the value is LIKELY b) finding an empty bucket is LIKELY c) growing the table is UNLIKELY I also switched the a) and b) cases for SmallPtrSet as we seem to use the set mostly more for insertion than for checking existence. In a simple benchmark consisting of 2^21 insertions of 2^20 unique pointers into a DenseMap or SmallPtrSet a few percent speedup on average, but nothing statistically significant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230232 91177308-0d34-0410-b5e6-96231b3b80d8
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