[llvm] [VPlan] Materialize constant vector trip counts before final opts. (PR #142309)

[via llvm-commits]

================
@@ -7329,6 +7329,7 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
                              BestVPlan, BestVF);
   VPlanTransforms::optimizeForVFAndUF(BestVPlan, BestVF, BestUF, PSE);
   VPlanTransforms::simplifyRecipes(BestVPlan, *Legal->getWidestInductionType());
+  VPlanTransforms::removeBranchOnConst(BestVPlan);
----------------
ayalz wrote:

This is in addition to running it as part of optimize(), rather than instead of?

https://github.com/llvm/llvm-project/pull/142309