[Analysis] 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/clang/lib/Analysis/UninitializedValues.cpp b/clang/lib/Analysis/UninitializedValues.cpp
index 8f9230c..5668862 100644
--- a/clang/lib/Analysis/UninitializedValues.cpp
+++ b/clang/lib/Analysis/UninitializedValues.cpp
@@ -90,7 +90,7 @@ void DeclToIndex::computeMap(const DeclContext &dc) {
 Optional<unsigned> DeclToIndex::getValueIndex(const VarDecl *d) const {
   llvm::DenseMap<const VarDecl *, unsigned>::const_iterator I = map.find(d);
   if (I == map.end())
-    return None;
+    return std::nullopt;
   return I->second;
 }