[VPlan] Remove now redundant VF assertion.

The assertion was added in preparation for
#9882. Remove assertion now
the PR has landed.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -10029,7 +10029,6 @@ bool LoopVectorizePass::processLoop(Loop *L) {
         EpilogueVectorizerMainLoop MainILV(L, PSE, LI, DT, TLI, TTI, AC, ORE,
                                            EPI, &LVL, &CM, BFI, PSI, Checks);
 
-        assert(EPI.MainLoopVF == VF.Width && "VFs must match");
         std::unique_ptr<VPlan> BestMainPlan(BestPlan.duplicate());
         const auto &[ExpandedSCEVs, ReductionResumeValues] = LVP.executePlan(
             EPI.MainLoopVF, EPI.MainLoopUF, *BestMainPlan, MainILV, DT, true);