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This reapplies r347767 (originally reviewed at: https://reviews.llvm.org/D55000) with a fix for the missing std::move of the Error returned by the call to Pipeline::runCycle(). Below is the original commit message from r347767. If a user only cares about the overall latency, then the best/quickest way is to change method Pipeline::run() so that it returns the total number of cycles to the caller. When the simulation pipeline is run, the number of cycles (or an error) is returned from method Pipeline::run(). The advantage is that no hardware event listener is needed for computing that latency. So, the whole process should be faster (and simpler - at least for that particular use case). llvm-svn: 347795
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