[NFC] Factor out predecessors collection into a separate method
It may be reused in a different piece of logic. Differential Revision: https://reviews.llvm.org/D50890 Reviewed By: reames llvm-svn: 340250
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It may be reused in a different piece of logic. Differential Revision: https://reviews.llvm.org/D50890 Reviewed By: reames llvm-svn: 340250