[LLVM] Use {} instead of std::nullopt to initialize empty ArrayRef (#109133)

It is almost always simpler to use {} instead of std::nullopt to
initialize an empty ArrayRef. This patch changes all occurrences I could
find in LLVM itself. In future the ArrayRef(std::nullopt_t) constructor
could be deprecated or removed.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/IR/Constants.cpp b/llvm/lib/IR/Constants.cpp
index 6d035d5..d6c00a4 100644
--- a/llvm/lib/IR/Constants.cpp
+++ b/llvm/lib/IR/Constants.cpp
@@ -2521,7 +2521,7 @@ Constant *ConstantExpr::getGetElementPtr(Type *Ty, Constant *C,
   }
 
   const ConstantExprKeyType Key(Instruction::GetElementPtr, ArgVec, NW.getRaw(),
-                                std::nullopt, Ty, InRange);
+                                {}, Ty, InRange);
 
   LLVMContextImpl *pImpl = C->getContext().pImpl;
   return pImpl->ExprConstants.getOrCreate(ReqTy, Key);