[llvm] [LoopSplitUtils] Prevent erasure of non-dead latch compares (PR #214243)

[Ramkumar Ramachandra via llvm-commits]

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@@ -518,8 +529,7 @@ static void rewriteLatch(Loop *PL, Value *IndOp, Value *SelEnd,
         /*IsExpected=*/false);
   }
   Term->eraseFromParent();
-  if (Cmp->use_empty())
-    Cmp->eraseFromParent();
+  return Cmp->use_empty() ? Cmp : nullptr;
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artagnon wrote:

Isn't this technically an "escaping value" that should be handled in collectEscapingValues?

https://github.com/llvm/llvm-project/pull/214243