[llvm] [VPlan] Track VPValue names in VPlan. (PR #81411)

[via llvm-commits]

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@@ -466,6 +478,8 @@ class VPSlotTracker {
       return -1;
     return I->second;
   }
+
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ayalz wrote:

Worth documenting?

https://github.com/llvm/llvm-project/pull/81411