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Blocks that contain only a single branch instruction to the next block can be skipped in analyzing the loop-nest structure. This is currently done by `getSingleSuccessor()`. However, the branch instruction might have multiple targets which happen to all be the same. In this case, the block should still be considered as empty and skipped. An example is `test/Transforms/LoopInterchange/update-condbranch-duplicate-successors.ll` (the LIT test for this patch is modified from it as well). Reviewed By: Whitney Differential Revision: https://reviews.llvm.org/D97286