[lldb] 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, 3 insertions, 3 deletions

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
index d0b2ef6..7dee031 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
@@ -45,18 +45,18 @@ llvm::Optional<DIERef>
 DebugNamesDWARFIndex::ToDIERef(const DebugNames::Entry &entry) {
   std::optional<uint64_t> cu_offset = entry.getCUOffset();
   if (!cu_offset)
-    return llvm::None;
+    return std::nullopt;
 
   DWARFUnit *cu = m_debug_info.GetUnitAtOffset(DIERef::Section::DebugInfo, *cu_offset);
   if (!cu)
-    return llvm::None;
+    return std::nullopt;
 
   cu = &cu->GetNonSkeletonUnit();
   if (std::optional<uint64_t> die_offset = entry.getDIEUnitOffset())
     return DIERef(cu->GetSymbolFileDWARF().GetDwoNum(),
                   DIERef::Section::DebugInfo, cu->GetOffset() + *die_offset);
 
-  return llvm::None;
+  return std::nullopt;
 }
 
 bool DebugNamesDWARFIndex::ProcessEntry(