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7f2cd21ddd
`BasicBlockFwdRefs` (and `BlockAddrFwdRefs` before it) was being emptied in a non-deterministic order. When predicting use-list order I've worked around this another way, but even when parsing lazily (and we can't recreate use-list order) use-lists should be deterministic. Make them so by using a side-queue of functions with forward-referenced blocks that gets visited in order. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214899 91177308-0d34-0410-b5e6-96231b3b80d8
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