[llvm] [LoopUnroll] Consider convergence control tokens when unrolling (PR #91715)

[Eli Friedman via llvm-commits]

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@@ -731,6 +740,16 @@ llvm::UnrollLoop(Loop *L, UnrollLoopOptions ULO, LoopInfo *LI,
           NewPHI->eraseFromParent();
         }
 
+        // Eliminate copies of the loop heart intrinsic, if any.
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efriedma-quic wrote:

If I understand the rules here correctly, this is only necessary if you're not completely unrolling the loop?

https://github.com/llvm/llvm-project/pull/91715