[IR] 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, 1 insertions, 1 deletions

diff --git a/llvm/lib/IR/Constants.cpp b/llvm/lib/IR/Constants.cpp
index d6a87c8..adbc158 100644
--- a/llvm/lib/IR/Constants.cpp
+++ b/llvm/lib/IR/Constants.cpp
@@ -2487,7 +2487,7 @@ Constant *ConstantExpr::getGetElementPtr(Type *Ty, Constant *C,
   if (InRangeIndex && *InRangeIndex < 63)
     SubClassOptionalData |= (*InRangeIndex + 1) << 1;
   const ConstantExprKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
-                                SubClassOptionalData, None, Ty);
+                                SubClassOptionalData, std::nullopt, Ty);
 
   LLVMContextImpl *pImpl = C->getContext().pImpl;
   return pImpl->ExprConstants.getOrCreate(ReqTy, Key);