[llvm] Replace None with std::nullopt in comments (NFC)

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/Analysis/LazyValueInfo.cpp b/llvm/lib/Analysis/LazyValueInfo.cpp
index 3491bce..789c290 100644
--- a/llvm/lib/Analysis/LazyValueInfo.cpp
+++ b/llvm/lib/Analysis/LazyValueInfo.cpp
@@ -162,7 +162,7 @@ namespace {
     struct BlockCacheEntry {
       SmallDenseMap<AssertingVH<Value>, ValueLatticeElement, 4> LatticeElements;
       SmallDenseSet<AssertingVH<Value>, 4> OverDefined;
-      // None indicates that the nonnull pointers for this basic block
+      // std::nullopt indicates that the nonnull pointers for this basic block
       // block have not been computed yet.
       std::optional<NonNullPointerSet> NonNullPointers;
     };