[VPlan] Use recipe debug loc instead of instr DLs in more cases (NFC)

Update both VPInterleaveRecipe and VPReplicateRecipe codegen to use
debug location directly from the recipe, not the underlying instruction.
This removes another dependency on underlying instructions.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -2385,7 +2385,7 @@ void InnerLoopVectorizer::scalarizeInstruction(const Instruction *Instr,
 
   RepRecipe->setFlags(Cloned);
 
-  if (auto DL = Instr->getDebugLoc())
+  if (auto DL = RepRecipe->getDebugLoc())
     State.setDebugLocFrom(DL);
 
   // Replace the operands of the cloned instructions with their scalar

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -2190,8 +2190,9 @@ class VPInterleaveRecipe : public VPRecipeBase {
   VPInterleaveRecipe(const InterleaveGroup<Instruction> *IG, VPValue *Addr,
                      ArrayRef<VPValue *> StoredValues, VPValue *Mask,
                      bool NeedsMaskForGaps)
-      : VPRecipeBase(VPDef::VPInterleaveSC, {Addr}), IG(IG),
-        NeedsMaskForGaps(NeedsMaskForGaps) {
+      : VPRecipeBase(VPDef::VPInterleaveSC, {Addr},
+                     IG->getInsertPos()->getDebugLoc()),
+        IG(IG), NeedsMaskForGaps(NeedsMaskForGaps) {
     for (unsigned i = 0; i < IG->getFactor(); ++i)
       if (Instruction *I = IG->getMember(i)) {
         if (I->getType()->isVoidTy())

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -3110,7 +3110,7 @@ void VPInterleaveRecipe::execute(VPTransformState &State) {
     ResAddr = State.Builder.CreateGEP(ScalarTy, ResAddr, Index, "", InBounds);
   }
 
-  State.setDebugLocFrom(Instr->getDebugLoc());
+  State.setDebugLocFrom(getDebugLoc());
   Value *PoisonVec = PoisonValue::get(VecTy);
 
   auto CreateGroupMask = [&BlockInMask, &State,