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node set rather than walking the SCC directly. This directly exposes the functions and has already had null entries filtered out. We also don't need need to handle optnone as it has already been handled in the caller -- we never try to remove convergent when there are optnone functions in the SCC. With this change, the code for removing convergent should work with the new pass manager and a different SCC analysis. llvm-svn: 260668
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