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

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

diff --git a/third-party/unittest/googletest/include/gtest/internal/custom/raw-ostream.h b/third-party/unittest/googletest/include/gtest/internal/custom/raw-ostream.h
index cff78f5..76dcdee 100644 (file)
--- a/third-party/unittest/googletest/include/gtest/internal/custom/raw-ostream.h
+++ b/third-party/unittest/googletest/include/gtest/internal/custom/raw-ostream.h
@@ -40,9 +40,9 @@ template <typename T> decltype(auto) printable(const T &V) {
 // If raw_ostream support is enabled, we specialize for types with operator<<
 // that takes a raw_ostream.
 #if !GTEST_NO_LLVM_SUPPORT
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/raw_os_ostream.h"
 #include "llvm/Support/raw_ostream.h"
+#include <optional>
 #include <ostream>
 namespace llvm_gtest {
 
@@ -68,14 +68,14 @@ struct StreamSwitch<T, decltype((void)(std::declval<llvm::raw_ostream &>()
   static const RawStreamProxy<T> printable(const T &V) { return {V}; }
 };
 
-// llvm::Optional has a template operator<<, which means it will not accept any
+// std::optional has a template operator<<, which means it will not accept any
 // implicit conversions, so we need to special-case it here.
 template <typename T>
-struct StreamSwitch<llvm::Optional<T>,
+struct StreamSwitch<std::optional<T>,
                     decltype((void)(std::declval<llvm::raw_ostream &>()
-                                    << std::declval<llvm::Optional<T>>()))> {
-  static const RawStreamProxy<llvm::Optional<T>>
-  printable(const llvm::Optional<T> &V) {
+                                    << std::declval<std::optional<T>>()))> {
+  static const RawStreamProxy<std::optional<T>>
+  printable(const std::optional<T> &V) {
     return {V};
   }
 };