[Transforms] 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/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index 2d9288b..c03fbe9 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -427,7 +427,7 @@ static bool removeRedundantDbgInstrsUsingForwardScan(BasicBlock *BB) {
       VariableMap;
   for (auto &I : *BB) {
     if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(&I)) {
-      DebugVariable Key(DVI->getVariable(), None,
+      DebugVariable Key(DVI->getVariable(), std::nullopt,
                         DVI->getDebugLoc()->getInlinedAt());
       auto VMI = VariableMap.find(Key);
       auto *DAI = dyn_cast<DbgAssignIntrinsic>(DVI);
@@ -488,7 +488,7 @@ static bool remomveUndefDbgAssignsFromEntryBlock(BasicBlock *BB) {
   DenseSet<DebugVariable> SeenDefForAggregate;
   // Returns the DebugVariable for DVI with no fragment info.
   auto GetAggregateVariable = [](DbgValueInst *DVI) {
-    return DebugVariable(DVI->getVariable(), None,
+    return DebugVariable(DVI->getVariable(), std::nullopt,
                          DVI->getDebugLoc()->getInlinedAt());
   };