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Assuming infinite issue width, compute the earliest each instruction in the trace can issue, when considering the latency of data dependencies. The issue cycle is record as a 'depth' from the beginning of the trace. This is half the computation required to find the length of the critical path through the trace. Heights are next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161074 91177308-0d34-0410-b5e6-96231b3b80d8
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