[llvm] [LV] Check if the VF is scalar by VFRange in `handleUncountableEarlyExit`. (PR #135294)

[David Sherwood via llvm-commits]

================
@@ -2435,8 +2437,12 @@ void VPlanTransforms::handleUncountableEarlyExit(
       ExitIRI->addOperand(IncomingFromLatch);
       ExitIRI->extractLastLaneOfOperand(MiddleBuilder);
     }
+
+    auto IsVector = [](ElementCount VF) { return VF.isVector(); };
     // Add the incoming value from the early exit.
-    if (!IncomingFromEarlyExit->isLiveIn() && !Plan.hasScalarVFOnly()) {
+    if (!IncomingFromEarlyExit->isLiveIn() &&
+        // Limit range to scalar VF only, if the range contains the scalar VF.
----------------
david-arm wrote:

Should this say `// Limit range to vector VF only ...`? The code below only works if we're dealing with vectors.

https://github.com/llvm/llvm-project/pull/135294