[VPlan] Enable DebugLoc coverage tracking (llvm#156045)

Post 92195f6 (Reapply "[DLCov] Implement DebugLoc coverage tracking"),
we should use DebugLoc::getUnknown() instead of the default constructor.

Author: artagnon

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -400,7 +400,7 @@ class LLVM_ABI_FOR_TEST VPRecipeBase
 
 public:
   VPRecipeBase(const unsigned char SC, ArrayRef<VPValue *> Operands,
-               DebugLoc DL = {})
+               DebugLoc DL = DebugLoc::getUnknown())
       : VPDef(SC), VPUser(Operands), DL(DL) {}
 
   virtual ~VPRecipeBase() = default;
@@ -518,11 +518,11 @@ class LLVM_ABI_FOR_TEST VPRecipeBase
 class VPSingleDefRecipe : public VPRecipeBase, public VPValue {
 public:
   VPSingleDefRecipe(const unsigned char SC, ArrayRef<VPValue *> Operands,
-                    DebugLoc DL = {})
+                    DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeBase(SC, Operands, DL), VPValue(this) {}
 
   VPSingleDefRecipe(const unsigned char SC, ArrayRef<VPValue *> Operands,
-                    Value *UV, DebugLoc DL = {})
+                    Value *UV, DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeBase(SC, Operands, DL), VPValue(this, UV) {}
 
   static inline bool classof(const VPRecipeBase *R) {
@@ -864,15 +864,16 @@ class VPIRFlags {
 /// using IR flags.
 struct VPRecipeWithIRFlags : public VPSingleDefRecipe, public VPIRFlags {
   VPRecipeWithIRFlags(const unsigned char SC, ArrayRef<VPValue *> Operands,
-                      DebugLoc DL = {})
+                      DebugLoc DL = DebugLoc::getUnknown())
       : VPSingleDefRecipe(SC, Operands, DL), VPIRFlags() {}
 
   VPRecipeWithIRFlags(const unsigned char SC, ArrayRef<VPValue *> Operands,
                       Instruction &I)
       : VPSingleDefRecipe(SC, Operands, &I, I.getDebugLoc()), VPIRFlags(I) {}
 
   VPRecipeWithIRFlags(const unsigned char SC, ArrayRef<VPValue *> Operands,
-                      const VPIRFlags &Flags, DebugLoc DL = {})
+                      const VPIRFlags &Flags,
+                      DebugLoc DL = DebugLoc::getUnknown())
       : VPSingleDefRecipe(SC, Operands, DL), VPIRFlags(Flags) {}
 
   static inline bool classof(const VPRecipeBase *R) {
@@ -1081,13 +1082,13 @@ class LLVM_ABI_FOR_TEST VPInstruction : public VPRecipeWithIRFlags,
 #endif
 
 public:
-  VPInstruction(unsigned Opcode, ArrayRef<VPValue *> Operands, DebugLoc DL = {},
-                const Twine &Name = "")
+  VPInstruction(unsigned Opcode, ArrayRef<VPValue *> Operands,
+                DebugLoc DL = DebugLoc::getUnknown(), const Twine &Name = "")
       : VPRecipeWithIRFlags(VPDef::VPInstructionSC, Operands, DL),
         VPIRMetadata(), Opcode(Opcode), Name(Name.str()) {}
 
   VPInstruction(unsigned Opcode, ArrayRef<VPValue *> Operands,
-                const VPIRFlags &Flags, DebugLoc DL = {},
+                const VPIRFlags &Flags, DebugLoc DL = DebugLoc::getUnknown(),
                 const Twine &Name = "");
 
   VP_CLASSOF_IMPL(VPDef::VPInstructionSC)
@@ -1480,7 +1481,8 @@ class VPWidenCastRecipe : public VPRecipeWithIRFlags, public VPIRMetadata {
   }
 
   VPWidenCastRecipe(Instruction::CastOps Opcode, VPValue *Op, Type *ResultTy,
-                    const VPIRFlags &Flags = {}, DebugLoc DL = {})
+                    const VPIRFlags &Flags = {},
+                    DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeWithIRFlags(VPDef::VPWidenCastSC, Op, Flags, DL),
         VPIRMetadata(), Opcode(Opcode), ResultTy(ResultTy) {
     assert(flagsValidForOpcode(Opcode) &&
@@ -1538,7 +1540,7 @@ class VPWidenIntrinsicRecipe : public VPRecipeWithIRFlags, public VPIRMetadata {
 public:
   VPWidenIntrinsicRecipe(CallInst &CI, Intrinsic::ID VectorIntrinsicID,
                          ArrayRef<VPValue *> CallArguments, Type *Ty,
-                         DebugLoc DL = {})
+                         DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeWithIRFlags(VPDef::VPWidenIntrinsicSC, CallArguments, CI),
         VPIRMetadata(CI), VectorIntrinsicID(VectorIntrinsicID), ResultTy(Ty),
         MayReadFromMemory(CI.mayReadFromMemory()),
@@ -1547,7 +1549,7 @@ class VPWidenIntrinsicRecipe : public VPRecipeWithIRFlags, public VPIRMetadata {
 
   VPWidenIntrinsicRecipe(Intrinsic::ID VectorIntrinsicID,
                          ArrayRef<VPValue *> CallArguments, Type *Ty,
-                         DebugLoc DL = {})
+                         DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeWithIRFlags(VPDef::VPWidenIntrinsicSC, CallArguments, DL),
         VPIRMetadata(), VectorIntrinsicID(VectorIntrinsicID), ResultTy(Ty) {
     LLVMContext &Ctx = Ty->getContext();
@@ -1616,7 +1618,8 @@ class LLVM_ABI_FOR_TEST VPWidenCallRecipe : public VPRecipeWithIRFlags,
 
 public:
   VPWidenCallRecipe(Value *UV, Function *Variant,
-                    ArrayRef<VPValue *> CallArguments, DebugLoc DL = {})
+                    ArrayRef<VPValue *> CallArguments,
+                    DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeWithIRFlags(VPDef::VPWidenCallSC, CallArguments,
                             *cast<Instruction>(UV)),
         VPIRMetadata(*cast<Instruction>(UV)), Variant(Variant) {
@@ -1666,7 +1669,7 @@ class VPHistogramRecipe : public VPRecipeBase {
 
 public:
   VPHistogramRecipe(unsigned Opcode, ArrayRef<VPValue *> Operands,
-                    DebugLoc DL = {})
+                    DebugLoc DL = DebugLoc::getUnknown())
       : VPRecipeBase(VPDef::VPHistogramSC, Operands, DL), Opcode(Opcode) {}
 
   ~VPHistogramRecipe() override = default;
@@ -2228,8 +2231,8 @@ class LLVM_ABI_FOR_TEST VPWidenPHIRecipe : public VPSingleDefRecipe,
 public:
   /// Create a new VPWidenPHIRecipe for \p Phi with start value \p Start and
   /// debug location \p DL.
-  VPWidenPHIRecipe(PHINode *Phi, VPValue *Start = nullptr, DebugLoc DL = {},
-                   const Twine &Name = "")
+  VPWidenPHIRecipe(PHINode *Phi, VPValue *Start = nullptr,
+                   DebugLoc DL = DebugLoc::getUnknown(), const Twine &Name = "")
       : VPSingleDefRecipe(VPDef::VPWidenPHISC, ArrayRef<VPValue *>(), Phi, DL),
         Name(Name.str()) {
     if (Start)
@@ -2559,14 +2562,14 @@ class LLVM_ABI_FOR_TEST VPReductionRecipe : public VPRecipeWithIRFlags {
 public:
   VPReductionRecipe(RecurKind RdxKind, FastMathFlags FMFs, Instruction *I,
                     VPValue *ChainOp, VPValue *VecOp, VPValue *CondOp,
-                    bool IsOrdered, DebugLoc DL = {})
+                    bool IsOrdered, DebugLoc DL = DebugLoc::getUnknown())
       : VPReductionRecipe(VPDef::VPReductionSC, RdxKind, FMFs, I,
                           ArrayRef<VPValue *>({ChainOp, VecOp}), CondOp,
                           IsOrdered, DL) {}
 
   VPReductionRecipe(const RecurKind RdxKind, FastMathFlags FMFs,
                     VPValue *ChainOp, VPValue *VecOp, VPValue *CondOp,
-                    bool IsOrdered, DebugLoc DL = {})
+                    bool IsOrdered, DebugLoc DL = DebugLoc::getUnknown())
       : VPReductionRecipe(VPDef::VPReductionSC, RdxKind, FMFs, nullptr,
                           ArrayRef<VPValue *>({ChainOp, VecOp}), CondOp,
                           IsOrdered, DL) {}
@@ -2684,7 +2687,7 @@ class VPPartialReductionRecipe : public VPReductionRecipe {
 class LLVM_ABI_FOR_TEST VPReductionEVLRecipe : public VPReductionRecipe {
 public:
   VPReductionEVLRecipe(VPReductionRecipe &R, VPValue &EVL, VPValue *CondOp,
-                       DebugLoc DL = {})
+                       DebugLoc DL = DebugLoc::getUnknown())
       : VPReductionRecipe(
             VPDef::VPReductionEVLSC, R.getRecurrenceKind(),
             R.getFastMathFlags(),
@@ -3535,7 +3538,8 @@ class LLVM_ABI_FOR_TEST VPScalarIVStepsRecipe : public VPRecipeWithIRFlags,
         InductionOpcode(Opcode) {}
 
   VPScalarIVStepsRecipe(const InductionDescriptor &IndDesc, VPValue *IV,
-                        VPValue *Step, VPValue *VF, DebugLoc DL = {})
+                        VPValue *Step, VPValue *VF,
+                        DebugLoc DL = DebugLoc::getUnknown())
       : VPScalarIVStepsRecipe(
             IV, Step, VF, IndDesc.getInductionOpcode(),
             dyn_cast_or_null<FPMathOperator>(IndDesc.getInductionBinOp())