[llvm] [LV, VPlan] Check if plan is compatible to EVL transform (PR #92092)

[Florian Hahn via llvm-commits]

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@@ -8553,8 +8576,12 @@ void LoopVectorizationPlanner::buildVPlansWithVPRecipes(ElementCount MinVF,
             *Plan, CM.getMinimalBitwidths(), PSE.getSE()->getContext());
       VPlanTransforms::optimize(*Plan, *PSE.getSE());
       // TODO: try to put it close to addActiveLaneMask().
-      if (CM.foldTailWithEVL())
+      if (CM.foldTailWithEVL()) {
+        // Don't generate plan if the plan is not EVL-compatible
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fhahn wrote:

Nit: the plan has already been generated, maybe 'discard` would be more accurate.

https://github.com/llvm/llvm-project/pull/92092