[ValueTracking] Remove unused Depth parameter (NFC)

Clarify that the Depth is always 0 in this function for a future
change.

Author: nikic

llvm/lib/Analysis/ValueTracking.cpp

@@ -6251,10 +6251,11 @@ static OverflowResult mapOverflowResult(ConstantRange::OverflowResult OR) {
 
 /// Combine constant ranges from computeConstantRange() and computeKnownBits().
 static ConstantRange computeConstantRangeIncludingKnownBits(
-    const Value *V, bool ForSigned, const DataLayout &DL, unsigned Depth,
-    AssumptionCache *AC, const Instruction *CxtI, const DominatorTree *DT,
+    const Value *V, bool ForSigned, const DataLayout &DL, AssumptionCache *AC,
+    const Instruction *CxtI, const DominatorTree *DT,
     bool UseInstrInfo = true) {
-  KnownBits Known = computeKnownBits(V, DL, Depth, AC, CxtI, DT, UseInstrInfo);
+  KnownBits Known =
+      computeKnownBits(V, DL, /*Depth=*/0, AC, CxtI, DT, UseInstrInfo);
   ConstantRange CR1 = ConstantRange::fromKnownBits(Known, ForSigned);
   ConstantRange CR2 = computeConstantRange(V, ForSigned, UseInstrInfo);
   ConstantRange::PreferredRangeType RangeType =
@@ -6323,9 +6324,9 @@ OverflowResult llvm::computeOverflowForUnsignedAdd(
     AssumptionCache *AC, const Instruction *CxtI, const DominatorTree *DT,
     bool UseInstrInfo) {
   ConstantRange LHSRange = computeConstantRangeIncludingKnownBits(
-      LHS, /*ForSigned=*/false, DL, /*Depth=*/0, AC, CxtI, DT, UseInstrInfo);
+      LHS, /*ForSigned=*/false, DL, AC, CxtI, DT, UseInstrInfo);
   ConstantRange RHSRange = computeConstantRangeIncludingKnownBits(
-      RHS, /*ForSigned=*/false, DL, /*Depth=*/0, AC, CxtI, DT, UseInstrInfo);
+      RHS, /*ForSigned=*/false, DL, AC, CxtI, DT, UseInstrInfo);
   return mapOverflowResult(LHSRange.unsignedAddMayOverflow(RHSRange));
 }
 
@@ -6359,9 +6360,9 @@ static OverflowResult computeOverflowForSignedAdd(const Value *LHS,
     return OverflowResult::NeverOverflows;
 
   ConstantRange LHSRange = computeConstantRangeIncludingKnownBits(
-      LHS, /*ForSigned=*/true, DL, /*Depth=*/0, AC, CxtI, DT);
+      LHS, /*ForSigned=*/true, DL, AC, CxtI, DT);
   ConstantRange RHSRange = computeConstantRangeIncludingKnownBits(
-      RHS, /*ForSigned=*/true, DL, /*Depth=*/0, AC, CxtI, DT);
+      RHS, /*ForSigned=*/true, DL, AC, CxtI, DT);
   OverflowResult OR =
       mapOverflowResult(LHSRange.signedAddMayOverflow(RHSRange));
   if (OR != OverflowResult::MayOverflow)
@@ -6426,9 +6427,9 @@ OverflowResult llvm::computeOverflowForUnsignedSub(const Value *LHS,
       return OverflowResult::AlwaysOverflowsLow;
     }
   ConstantRange LHSRange = computeConstantRangeIncludingKnownBits(
-      LHS, /*ForSigned=*/false, DL, /*Depth=*/0, AC, CxtI, DT);
+      LHS, /*ForSigned=*/false, DL, AC, CxtI, DT);
   ConstantRange RHSRange = computeConstantRangeIncludingKnownBits(
-      RHS, /*ForSigned=*/false, DL, /*Depth=*/0, AC, CxtI, DT);
+      RHS, /*ForSigned=*/false, DL, AC, CxtI, DT);
   return mapOverflowResult(LHSRange.unsignedSubMayOverflow(RHSRange));
 }
 
@@ -6458,9 +6459,9 @@ OverflowResult llvm::computeOverflowForSignedSub(const Value *LHS,
     return OverflowResult::NeverOverflows;
 
   ConstantRange LHSRange = computeConstantRangeIncludingKnownBits(
-      LHS, /*ForSigned=*/true, DL, /*Depth=*/0, AC, CxtI, DT);
+      LHS, /*ForSigned=*/true, DL, AC, CxtI, DT);
   ConstantRange RHSRange = computeConstantRangeIncludingKnownBits(
-      RHS, /*ForSigned=*/true, DL, /*Depth=*/0, AC, CxtI, DT);
+      RHS, /*ForSigned=*/true, DL, AC, CxtI, DT);
   return mapOverflowResult(LHSRange.signedSubMayOverflow(RHSRange));
 }