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Summary: This adds three Function methods to handle function entry counts: setEntryCount() and getEntryCount(). Entry counts are stored under the MD_prof metadata node with the name "function_entry_count". They are unsigned 64 bit values set by profilers (instrumentation and sample profiler changes coming up). Added documentation for new profile metadata and tests. Reviewers: dexonsmith, bogner Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D9628 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237260 91177308-0d34-0410-b5e6-96231b3b80d8
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