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To the best of my knowledge -metarenamer is used in two cases: 1) obfuscate names, when e.g. they contain informations that can't be shared. 2) Improve clarity of the textual IR for testcases. One of the usecases if getting the output of `opt` and passing it to the lli interpreter to run the test. If metarenamer renames @main, lli can't find an entry point. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309657 91177308-0d34-0410-b5e6-96231b3b80d8