[VPlan] Early assert for unsupported interleaved access features. nfc (#146669)

Author: Mel-Chen

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -2346,6 +2346,9 @@ class VPInterleaveRecipe : public VPRecipeBase {
                      DL),
 
         IG(IG), NeedsMaskForGaps(NeedsMaskForGaps) {
+    // TODO: extend the masked interleaved-group support to reversed access.
+    assert((!Mask || !IG->isReverse()) &&
+           "Reversed masked interleave-group not supported.");
     for (unsigned i = 0; i < IG->getFactor(); ++i)
       if (Instruction *I = IG->getMember(i)) {
         if (I->getType()->isVoidTy())

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -3439,11 +3439,7 @@ void VPInterleaveRecipe::execute(VPTransformState &State) {
   unsigned InterleaveFactor = Group->getFactor();
   auto *VecTy = VectorType::get(ScalarTy, State.VF * InterleaveFactor);
 
-  // TODO: extend the masked interleaved-group support to reversed access.
   VPValue *BlockInMask = getMask();
-  assert((!BlockInMask || !Group->isReverse()) &&
-         "Reversed masked interleave-group not supported.");
-
   VPValue *Addr = getAddr();
   Value *ResAddr = State.get(Addr, VPLane(0));
   if (auto *I = dyn_cast<Instruction>(ResAddr))