[IndVars] Don't assume backedge value is instruction (PR64891)
In degenerate cases, the backedge value can be folded to poison. Fixes https://github.com/llvm/llvm-project/issues/64891.
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In degenerate cases, the backedge value can be folded to poison. Fixes https://github.com/llvm/llvm-project/issues/64891.