[llvm] [LV] Use original trip-count as the vector-trip-count if use predicated EVL instructions for tail-folding. (PR #132675)

[Mel Chen via llvm-commits]

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@@ -1905,7 +1906,9 @@ bool VPlanTransforms::tryAddExplicitVectorLength(
   // Replace all uses of VPCanonicalIVPHIRecipe by
   // VPEVLBasedIVPHIRecipe except for the canonical IV increment.
   CanonicalIVPHI->replaceAllUsesWith(EVLPhi);
+  CanonicalIVIncrement->replaceAllUsesWith(NextEVLIV);
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Mel-Chen wrote:

Why not erase CanonicalIVIncrement from parent if we replaced all uses of CanonicalIVIncrement?

https://github.com/llvm/llvm-project/pull/132675