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Instead of DFS numbering basic blocks we now DFS number instructions that avoids the costly operation of which instruction comes first in a basic block. Patch mostly written by Daniel Berlin. Differential Revision: https://reviews.llvm.org/D22777 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276714 91177308-0d34-0410-b5e6-96231b3b80d8