[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, 1 insertions, 1 deletions

diff --git a/llvm/lib/MC/MCWin64EH.cpp b/llvm/lib/MC/MCWin64EH.cpp
index 5102d48..d37800a 100644
--- a/llvm/lib/MC/MCWin64EH.cpp
+++ b/llvm/lib/MC/MCWin64EH.cpp
@@ -287,7 +287,7 @@ static Optional<int64_t> GetOptionalAbsDifference(MCStreamer &Streamer,
   // unusual constructs, like an inline asm with an alignment directive.
   int64_t value;
   if (!Diff->evaluateAsAbsolute(value, OS->getAssembler()))
-    return None;
+    return std::nullopt;
   return value;
 }