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Add an option to llvm-profdata merge for writing out sparse indexed profiles. These profiles omit InstrProfRecords for functions which are never executed. Differential Revision: http://reviews.llvm.org/D16727 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259258 91177308-0d34-0410-b5e6-96231b3b80d8