[flang] Use std::optional instead of llvm::Optional (NFC)

This patch replaces (llvm::|)Optional< with std::optional<.  I'll post
a separate patch to remove #include "llvm/ADT/Optional.h".

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, 2 insertions, 2 deletions

diff --git a/flang/lib/Optimizer/CodeGen/TargetRewrite.cpp b/flang/lib/Optimizer/CodeGen/TargetRewrite.cpp
index b19bb5e..223a8bc 100644
--- a/flang/lib/Optimizer/CodeGen/TargetRewrite.cpp
+++ b/flang/lib/Optimizer/CodeGen/TargetRewrite.cpp
@@ -65,7 +65,7 @@ struct FixupTy {
   Codes code;
   std::size_t index;
   std::size_t second{};
-  llvm::Optional<std::function<void(mlir::func::FuncOp)>> finalizer{};
+  std::optional<std::function<void(mlir::func::FuncOp)>> finalizer{};
 }; // namespace
 
 /// Target-specific rewriting of the FIR. This is a prerequisite pass to code
@@ -215,7 +215,7 @@ public:
     }
 
     // Determine the rewrite function, `wrap`, for the result value.
-    llvm::Optional<std::function<mlir::Value(mlir::Operation *)>> wrap;
+    std::optional<std::function<mlir::Value(mlir::Operation *)>> wrap;
     if (fnTy.getResults().size() == 1) {
       mlir::Type ty = fnTy.getResult(0);
       llvm::TypeSwitch<mlir::Type>(ty)