[Transforms] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index c9fe093..d4d061a 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -2174,7 +2174,7 @@ bool llvm::replaceAllDbgUsesWith(Instruction &From, Value &To,
       // Without knowing signedness, sign/zero extension isn't possible.
       auto Signedness = Var->getSignedness();
       if (!Signedness)
-        return None;
+        return std::nullopt;
 
       bool Signed = *Signedness == DIBasicType::Signedness::Signed;
       return DIExpression::appendExt(DII.getExpression(), ToBits, FromBits,
@@ -2912,7 +2912,7 @@ void llvm::copyRangeMetadata(const DataLayout &DL, const LoadInst &OldLI,
 
   unsigned BitWidth = DL.getPointerTypeSizeInBits(NewTy);
   if (!getConstantRangeFromMetadata(*N).contains(APInt(BitWidth, 0))) {
-    MDNode *NN = MDNode::get(OldLI.getContext(), None);
+    MDNode *NN = MDNode::get(OldLI.getContext(), std::nullopt);
     NewLI.setMetadata(LLVMContext::MD_nonnull, NN);
   }
 }
@@ -3021,7 +3021,7 @@ collectBitParts(Value *V, bool MatchBSwaps, bool MatchBitReversals,
   if (I != BPS.end())
     return I->second;
 
-  auto &Result = BPS[V] = None;
+  auto &Result = BPS[V] = std::nullopt;
   auto BitWidth = V->getType()->getScalarSizeInBits();
 
   // Can't do integer/elements > 128 bits.
@@ -3057,7 +3057,7 @@ collectBitParts(Value *V, bool MatchBSwaps, bool MatchBitReversals,
         if (A->Provenance[BitIdx] != BitPart::Unset &&
             B->Provenance[BitIdx] != BitPart::Unset &&
             A->Provenance[BitIdx] != B->Provenance[BitIdx])
-          return Result = None;
+          return Result = std::nullopt;
 
         if (A->Provenance[BitIdx] == BitPart::Unset)
           Result->Provenance[BitIdx] = B->Provenance[BitIdx];