David Blaikie 4fc8298f17 AddressPool::HasBeenUsed: Add comment explaining the use-case for this flag.
Based on code review by Eric Christopher on r207323

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207460 91177308-0d34-0410-b5e6-96231b3b80d8
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