[llvm] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

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, 5 insertions, 5 deletions

diff --git a/llvm/lib/Support/JSON.cpp b/llvm/lib/Support/JSON.cpp
index 6cd0097..22219ac 100644
--- a/llvm/lib/Support/JSON.cpp
+++ b/llvm/lib/Support/JSON.cpp
@@ -40,27 +40,27 @@ const Value *Object::get(StringRef K) const {
 llvm::Optional<std::nullptr_t> Object::getNull(StringRef K) const {
   if (auto *V = get(K))
     return V->getAsNull();
-  return llvm::None;
+  return std::nullopt;
 }
 llvm::Optional<bool> Object::getBoolean(StringRef K) const {
   if (auto *V = get(K))
     return V->getAsBoolean();
-  return llvm::None;
+  return std::nullopt;
 }
 llvm::Optional<double> Object::getNumber(StringRef K) const {
   if (auto *V = get(K))
     return V->getAsNumber();
-  return llvm::None;
+  return std::nullopt;
 }
 llvm::Optional<int64_t> Object::getInteger(StringRef K) const {
   if (auto *V = get(K))
     return V->getAsInteger();
-  return llvm::None;
+  return std::nullopt;
 }
 llvm::Optional<llvm::StringRef> Object::getString(StringRef K) const {
   if (auto *V = get(K))
     return V->getAsString();
-  return llvm::None;
+  return std::nullopt;
 }
 const json::Object *Object::getObject(StringRef K) const {
   if (auto *V = get(K))