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4198c58c71
1. Fix some bugs in the jump table lowering threshold 2. Implement much better metric for optimal pivot selection 3. Tune thresholds for different lowering methods 4. Implement shift-and trick for lowering small (<machine word length) cases with few destinations. Good testcase will follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35816 91177308-0d34-0410-b5e6-96231b3b80d8