[LV] Improve code using VPlan::get{ConstantInt,True} (NFC) (#172471)

Author: artagnon

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -7806,12 +7806,9 @@ VPSingleDefRecipe *VPRecipeBuilder::tryToWidenCall(VPInstruction *VPI,
       //   2) No mask is required for the block, but the only available
       //      vector variant at this VF requires a mask, so we synthesize an
       //      all-true mask.
-      VPValue *Mask = nullptr;
-      if (Legal->isMaskRequired(CI))
-        Mask = getBlockInMask(Builder.getInsertBlock());
-      else
-        Mask = Plan.getOrAddLiveIn(
-            ConstantInt::getTrue(IntegerType::getInt1Ty(Plan.getContext())));
+      VPValue *Mask = Legal->isMaskRequired(CI)
+                          ? getBlockInMask(Builder.getInsertBlock())
+                          : Plan.getTrue();
 
       Ops.insert(Ops.begin() + *MaskPos, Mask);
     }
@@ -8253,9 +8250,8 @@ VPRecipeBuilder::tryToCreatePartialReduction(VPInstruction *Reduction,
 
   auto *ReductionI = Reduction->getUnderlyingInstr();
   if (Reduction->getOpcode() == Instruction::Sub) {
-    auto *const Zero = ConstantInt::get(ReductionI->getType(), 0);
     SmallVector<VPValue *, 2> Ops;
-    Ops.push_back(Plan.getOrAddLiveIn(Zero));
+    Ops.push_back(Plan.getConstantInt(ReductionI->getType(), 0));
     Ops.push_back(BinOp);
     BinOp = new VPWidenRecipe(*ReductionI, Ops, VPIRFlags(*ReductionI),
                               VPIRMetadata(), ReductionI->getDebugLoc());