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James Molloy 4b739069e4 [LoopReroll] Don't crash on dead code
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
2015-02-16 17:01:52 +00:00
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2015-02-15 19:07:31 +00:00
2015-02-12 16:30:00 +00:00