[LV] Update stale comment after 4e05d70. (NFC)

Address post-commit suggestion, update stale comment after 4e05d70.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -9347,7 +9347,7 @@ static InstructionCost calculateEarlyExitCost(VPCostContext &CostCtx,
 ///  2. In the case of loops with uncountable early exits, we may have to do
 ///     extra work when exiting the loop early, such as calculating the final
 ///     exit values of variables used outside the loop.
-///  3. The middle block, if expected TC <= VF.Width.
+///  3. The middle block.
 static bool isOutsideLoopWorkProfitable(GeneratedRTChecks &Checks,
                                         VectorizationFactor &VF, Loop *L,
                                         PredicatedScalarEvolution &PSE,