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This commit adds a wrapper for std::distance() which works with ranges. As it would be a common case to write `distance(predecessors(BB))`, this also introduces `pred_size()` and `succ_size()` helpers to make that easier to write. Differential Revision: https://reviews.llvm.org/D46668 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332057 91177308-0d34-0410-b5e6-96231b3b80d8