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This is in preparation for a fix to llvm.org/PR22262. One of the ideas here is to first find a good jump table range first and then split before and after it. Thereby, we don't need to use the split-based-on-density heuristic at all, which can make the "binary tree" deteriorate in various cases. Also some minor cleanups. No functional changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226551 91177308-0d34-0410-b5e6-96231b3b80d8