[llvm] [VPlan] Make canonical IV part of the region (PR #156262)

[via llvm-commits]

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@@ -9685,12 +9681,12 @@ preparePlanForEpilogueVectorLoop(VPlan &Plan, Loop *L,
         ToFrozen[StartV] = cast<PHINode>(ResumeV)->getIncomingValueForBlock(
             EPI.MainLoopIterationCountCheck);
 
-        // VPReductionPHIRecipe for FindFirstIV/FindLastIV reductions requires
-        // an adjustment to the resume value. The resume value is adjusted to
-        // the sentinel value when the final value from the main vector loop
-        // equals the start value. This ensures correctness when the start value
-        // might not be less than the minimum value of a monotonically
-        // increasing induction variable.
+        // VPReductionPHIRecipe for FindFirstIV/FindLastIV reductions
+        // requires an adjustment to the resume value. The resume value is
+        // adjusted to the sentinel value when the final value from the main
+        // vector loop equals the start value. This ensures correctness when
+        // the start value might not be less than the minimum value of a
+        // monotonically increasing induction variable.
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ayalz wrote:

Independent NFC?

https://github.com/llvm/llvm-project/pull/156262