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When a trace ends with a back-edge, include PHIs in the loop header in the height computations. This makes the critical path through a loop more accurate by including the latencies of the last instructions in the loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161688 91177308-0d34-0410-b5e6-96231b3b80d8
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