[llvm] [VPlan] Only use selectVectorizationFactor for cross-check (NFCI). (PR #103033)

[via llvm-commits]

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@@ -1695,6 +1695,10 @@ VPlan &LoopVectorizationPlanner::getPlanFor(ElementCount VF) const {
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 void LoopVectorizationPlanner::printPlans(raw_ostream &O) {
+  if (VPlans.empty()) {
+    O << "LV: Not VPlans built.";
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ayalz wrote:

```suggestion
    O << "LV: No VPlans built.";
```

https://github.com/llvm/llvm-project/pull/103033