[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/MC/MCCodeView.cpp b/llvm/lib/MC/MCCodeView.cpp
index 99d7e96e..04e6a66 100644
--- a/llvm/lib/MC/MCCodeView.cpp
+++ b/llvm/lib/MC/MCCodeView.cpp
@@ -318,9 +318,9 @@ std::pair<size_t, size_t> CodeViewContext::getLineExtent(unsigned FuncId) {
 
 ArrayRef<MCCVLoc> CodeViewContext::getLinesForExtent(size_t L, size_t R) {
   if (R <= L)
-    return None;
+    return std::nullopt;
   if (L >= MCCVLines.size())
-    return None;
+    return std::nullopt;
   return makeArrayRef(&MCCVLines[L], R - L);
 }