[VPlan] Add getContext helper to VPlan (NFC).

(cherry picked from commit f8b1c73)

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -4068,6 +4068,10 @@ class VPlan {
   /// Returns VF * UF of the vector loop region.
   VPValue &getVFxUF() { return VFxUF; }
 
+  LLVMContext &getContext() const {
+    return getScalarHeader()->getIRBasicBlock()->getContext();
+  }
+
   void addVF(ElementCount VF) { VFs.insert(VF); }
 
   void setVF(ElementCount VF) {

llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp

@@ -568,11 +568,11 @@ void VPlanTransforms::prepareForVectorization(
   VPBuilder Builder(MiddleVPBB);
   VPValue *Cmp;
   if (!RequiresScalarEpilogueCheck)
-    Cmp = Plan.getOrAddLiveIn(ConstantInt::getFalse(
-        IntegerType::getInt1Ty(TripCount->getType()->getContext())));
+    Cmp = Plan.getOrAddLiveIn(
+        ConstantInt::getFalse(IntegerType::getInt1Ty(Plan.getContext())));
   else if (TailFolded)
-    Cmp = Plan.getOrAddLiveIn(ConstantInt::getTrue(
-        IntegerType::getInt1Ty(TripCount->getType()->getContext())));
+    Cmp = Plan.getOrAddLiveIn(
+        ConstantInt::getTrue(IntegerType::getInt1Ty(Plan.getContext())));
   else
     Cmp = Builder.createICmp(CmpInst::ICMP_EQ, Plan.getTripCount(),
                              &Plan.getVectorTripCount(), LatchDL, "cmp.n");
@@ -622,7 +622,7 @@ void VPlanTransforms::attachCheckBlock(VPlan &Plan, Value *Cond,
                    .createNaryOp(VPInstruction::BranchOnCond, {CondVPV},
                                  Plan.getCanonicalIV()->getDebugLoc());
   if (AddBranchWeights) {
-    MDBuilder MDB(Plan.getScalarHeader()->getIRBasicBlock()->getContext());
+    MDBuilder MDB(Plan.getContext());
     MDNode *BranchWeights =
         MDB.createBranchWeights(CheckBypassWeights, /*IsExpected=*/false);
     Term->addMetadata(LLVMContext::MD_prof, BranchWeights);

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

@@ -1370,7 +1370,7 @@ static bool optimizeVectorInductionWidthForTCAndVFUF(VPlan &Plan,
   unsigned NewBitWidth =
       ComputeBitWidth(TC->getValue(), BestVF.getKnownMinValue() * BestUF);
 
-  LLVMContext &Ctx = Plan.getCanonicalIV()->getScalarType()->getContext();
+  LLVMContext &Ctx = Plan.getContext();
   auto *NewIVTy = IntegerType::get(Ctx, NewBitWidth);
 
   bool MadeChange = false;
@@ -2534,8 +2534,8 @@ void VPlanTransforms::createInterleaveGroups(
                    DL.getTypeAllocSize(getLoadStoreType(IRInsertPos)) *
                        IG->getIndex(IRInsertPos),
                    /*IsSigned=*/true);
-      VPValue *OffsetVPV = Plan.getOrAddLiveIn(
-          ConstantInt::get(IRInsertPos->getParent()->getContext(), -Offset));
+      VPValue *OffsetVPV =
+          Plan.getOrAddLiveIn(ConstantInt::get(Plan.getContext(), -Offset));
       VPBuilder B(InsertPos);
       Addr = InBounds ? B.createInBoundsPtrAdd(InsertPos->getAddr(), OffsetVPV)
                       : B.createPtrAdd(InsertPos->getAddr(), OffsetVPV);
@@ -3409,7 +3409,7 @@ void VPlanTransforms::addBranchWeightToMiddleTerminator(
   if (VF.isScalable() && VScaleForTuning.has_value())
     VectorStep *= *VScaleForTuning;
   assert(VectorStep > 0 && "trip count should not be zero");
-  MDBuilder MDB(Plan.getScalarHeader()->getIRBasicBlock()->getContext());
+  MDBuilder MDB(Plan.getContext());
   MDNode *BranchWeights =
       MDB.createBranchWeights({1, VectorStep - 1}, /*IsExpected=*/false);
   MiddleTerm->addMetadata(LLVMContext::MD_prof, BranchWeights);