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4b739069e4
If a PHI has no users, don't crash; bail gracefully. This shouldn't happen often, but we can make no guarantees that previous passes didn't leave dead code around. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229405 91177308-0d34-0410-b5e6-96231b3b80d8