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Summary: Lately, I have submitted a number of patches to fix bugs that only occurred when using the same pass manager to compile multiple modules (generally these bugs are failure to reset some persistent state). Unfortunately I don't think there is currently a way to test that from the command line. This adds a very simple flag to both llc and opt, under which the tools will simply re-run their respective pass pipelines using the same pass manager on (a clone of the same module). Additionally, we verify that both outputs are bitwise the same. Reviewers: yaron.keren Subscribers: loladiro, yaron.keren, kcc, llvm-commits Differential Revision: http://reviews.llvm.org/D14965 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254774 91177308-0d34-0410-b5e6-96231b3b80d8