[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/DebugInfoMetadata.cpp b/llvm/lib/IR/DebugInfoMetadata.cpp
index 416cebb..fb4326e 100644
--- a/llvm/lib/IR/DebugInfoMetadata.cpp
+++ b/llvm/lib/IR/DebugInfoMetadata.cpp
@@ -1954,7 +1954,7 @@ DIExpression *DIExpression::append(const DIExpression *Expr,
       NewOps.append(Ops.begin(), Ops.end());
 
       // Ensure that the new opcodes are only appended once.
-      Ops = std::nullopt;
+      Ops = {};
     }
     Op.appendToVector(NewOps);
   }