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This was marking the loop for deletion after the loop was deleted. This almost works, except that when we do any kind of debug logging it starts reading the name of the loop from deleted memory or otherwise blowing up. This can fail in a bunch of ways. I recently added a test that *always* does this, and it started failing on the sanitizer bots. The fix is to mark the loop as deleted in the loop PM infrastructure before we remove the loop. We can do this by passing the updater into the routine. That also lets us simplify a bunch of other interface components here for a net win. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294810 91177308-0d34-0410-b5e6-96231b3b80d8
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