[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, 2 insertions, 2 deletions

diff --git a/llvm/lib/AsmParser/Parser.cpp b/llvm/lib/AsmParser/Parser.cpp
index 4458ae7..5df7789 100644
--- a/llvm/lib/AsmParser/Parser.cpp
+++ b/llvm/lib/AsmParser/Parser.cpp
@@ -93,7 +93,7 @@ ParsedModuleAndIndex llvm::parseAssemblyWithIndex(MemoryBufferRef F,
                                                   SlotMapping *Slots) {
   return ::parseAssemblyWithIndex(F, Err, Context, Slots,
                                   /*UpgradeDebugInfo*/ true,
-                                  [](StringRef) { return None; });
+                                  [](StringRef) { return std::nullopt; });
 }
 
 static ParsedModuleAndIndex
@@ -150,7 +150,7 @@ static bool parseSummaryIndexAssemblyInto(MemoryBufferRef F,
   // index, but we need to initialize it.
   LLVMContext unusedContext;
   return LLParser(F.getBuffer(), SM, Err, nullptr, &Index, unusedContext)
-      .Run(true, [](StringRef) { return None; });
+      .Run(true, [](StringRef) { return std::nullopt; });
 }
 
 std::unique_ptr<ModuleSummaryIndex>