XChy 2c0fc0f37f [DFAJumpThreading] Handle circular determinator (#78177) ...

Fixes the buildbot failure in
https://github.com/llvm/llvm-project/pull/78134#issuecomment-1892195197
When we meet the path with single `determinator`, the determinator
actually takes itself as a predecessor. Thus, we need to let `Prev` be
the determinator when `PathBBs` has only one element.

2024-01-15 17:52:53 -08:00

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