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

[via llvm-commits]

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@@ -1373,32 +1362,73 @@ VPInterleavedAccessInfo::VPInterleavedAccessInfo(VPlan &Plan,
   visitRegion(Plan.getVectorLoopRegion(), Old2New, IAI);
 }
 
-void VPSlotTracker::assignSlot(const VPValue *V) {
-  if (V->getUnderlyingValue())
+void VPSlotTracker::assignSlotOrName(const VPValue *V) {
+  if (auto *UV = V->getUnderlyingValue()) {
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ayalz wrote:

nit: else case is simpler to go first. (Name also suggests Slot goes first ;)

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