[IR] llvm::Optional => std::optional

Many llvm/IR/* files have been migrated by other contributors.
This migrates most remaining files.

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/IR/ConstantRange.cpp b/llvm/lib/IR/ConstantRange.cpp
index d443f2c..553e565 100644
--- a/llvm/lib/IR/ConstantRange.cpp
+++ b/llvm/lib/IR/ConstantRange.cpp
@@ -699,7 +699,7 @@ ConstantRange ConstantRange::unionWith(const ConstantRange &CR,
   return ConstantRange(std::move(L), std::move(U));
 }
 
-Optional<ConstantRange>
+std::optional<ConstantRange>
 ConstantRange::exactIntersectWith(const ConstantRange &CR) const {
   // TODO: This can be implemented more efficiently.
   ConstantRange Result = intersectWith(CR);
@@ -708,7 +708,7 @@ ConstantRange::exactIntersectWith(const ConstantRange &CR) const {
   return std::nullopt;
 }
 
-Optional<ConstantRange>
+std::optional<ConstantRange>
 ConstantRange::exactUnionWith(const ConstantRange &CR) const {
   // TODO: This can be implemented more efficiently.
   ConstantRange Result = unionWith(CR);