[Sema] 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, 1 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaModule.cpp b/clang/lib/Sema/SemaModule.cpp
index 1a48a060..bb045760 100644
--- a/clang/lib/Sema/SemaModule.cpp
+++ b/clang/lib/Sema/SemaModule.cpp
@@ -836,7 +836,7 @@ static llvm::Optional<UnnamedDeclKind> getUnnamedDeclKind(Decl *D) {
   if (isa<UsingDirectiveDecl>(D))
     return UnnamedDeclKind::UsingDirective;
   // Everything else either introduces one or more names or is ill-formed.
-  return llvm::None;
+  return std::nullopt;
 }
 
 unsigned getUnnamedDeclDiag(UnnamedDeclKind UDK, bool InBlock) {