[clang] 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, 6 insertions, 6 deletions

diff --git a/clang/lib/Lex/ModuleMap.cpp b/clang/lib/Lex/ModuleMap.cpp
index 4e86c5c..b66d95d 100644
--- a/clang/lib/Lex/ModuleMap.cpp
+++ b/clang/lib/Lex/ModuleMap.cpp
@@ -189,7 +189,7 @@ Optional<FileEntryRef> ModuleMap::findHeader(
         expectedToOptional(SourceMgr.getFileManager().getFileRef(Filename));
     if (!File || (Header.Size && File->getSize() != *Header.Size) ||
         (Header.ModTime && File->getModificationTime() != *Header.ModTime))
-      return None;
+      return std::nullopt;
     return *File;
   };
 
@@ -247,7 +247,7 @@ Optional<FileEntryRef> ModuleMap::findHeader(
           << Header.FileName << M->getFullModuleName();
       NeedsFramework = true;
     }
-    return None;
+    return std::nullopt;
   }
 
   return NormalHdrFile;
@@ -482,7 +482,7 @@ void ModuleMap::diagnoseHeaderInclusion(Module *RequestingModule,
 
   if (RequestingModule) {
     resolveUses(RequestingModule, /*Complain=*/false);
-    resolveHeaderDirectives(RequestingModule, /*File=*/llvm::None);
+    resolveHeaderDirectives(RequestingModule, /*File=*/std::nullopt);
   }
 
   bool Excluded = false;
@@ -690,7 +690,7 @@ ModuleMap::findAllModulesForHeader(const FileEntry *File) {
   if (findOrCreateModuleForHeaderInUmbrellaDir(File))
     return Headers.find(File)->second;
 
-  return None;
+  return std::nullopt;
 }
 
 ArrayRef<ModuleMap::KnownHeader>
@@ -699,7 +699,7 @@ ModuleMap::findResolvedModulesForHeader(const FileEntry *File) const {
   resolveHeaderDirectives(File);
   auto It = Headers.find(File);
   if (It == Headers.end())
-    return None;
+    return std::nullopt;
   return It->second;
 }
 
@@ -1262,7 +1262,7 @@ void ModuleMap::addHeader(Module *Mod, Module::Header Header,
 Optional<FileEntryRef>
 ModuleMap::getContainingModuleMapFile(const Module *Module) const {
   if (Module->DefinitionLoc.isInvalid())
-    return None;
+    return std::nullopt;
 
   return SourceMgr.getFileEntryRefForID(
       SourceMgr.getFileID(Module->DefinitionLoc));