[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, 4 insertions, 4 deletions

diff --git a/llvm/lib/Support/VirtualFileSystem.cpp b/llvm/lib/Support/VirtualFileSystem.cpp
index 3c4ce94..ace5827 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -1013,8 +1013,8 @@ bool InMemoryFileSystem::addHardLink(const Twine &NewLink,
   // before. Resolved ToPath must be a File.
   if (!TargetNode || NewLinkNode || !isa<detail::InMemoryFile>(*TargetNode))
     return false;
-  return addFile(NewLink, 0, nullptr, None, None, None, None,
-                 [&](detail::NewInMemoryNodeInfo NNI) {
+  return addFile(NewLink, 0, nullptr, std::nullopt, std::nullopt, std::nullopt,
+                 std::nullopt, [&](detail::NewInMemoryNodeInfo NNI) {
                    return std::make_unique<detail::InMemoryHardLink>(
                        NNI.Path.str(),
                        *cast<detail::InMemoryFile>(*TargetNode));
@@ -1610,7 +1610,7 @@ class llvm::vfs::RedirectingFileSystemParser {
     SmallString<12> Storage;
     StringRef Value;
     if (!parseScalarString(N, Value, Storage))
-      return None;
+      return std::nullopt;
 
     if (Value.equals_insensitive("fallthrough")) {
       return RedirectingFileSystem::RedirectKind::Fallthrough;
@@ -1619,7 +1619,7 @@ class llvm::vfs::RedirectingFileSystemParser {
     } else if (Value.equals_insensitive("redirect-only")) {
       return RedirectingFileSystem::RedirectKind::RedirectOnly;
     }
-    return None;
+    return std::nullopt;
   }
 
   struct KeyStatus {