[polly] 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

2 files changed, 6 insertions, 6 deletions

diff --git a/polly/lib/Analysis/ScopInfo.cpp b/polly/lib/Analysis/ScopInfo.cpp
index bbbb177..210f816 100644
--- a/polly/lib/Analysis/ScopInfo.cpp
+++ b/polly/lib/Analysis/ScopInfo.cpp
@@ -1599,7 +1599,7 @@ Scop::Scop(Region &R, ScalarEvolution &ScalarEvolution, LoopInfo &LI,
            DominatorTree &DT, ScopDetection::DetectionContext &DC,
            OptimizationRemarkEmitter &ORE, int ID)
     : IslCtx(isl_ctx_alloc(), isl_ctx_free), SE(&ScalarEvolution), DT(&DT),
-      R(R), name(None), HasSingleExitEdge(R.getExitingBlock()), DC(DC),
+      R(R), name(std::nullopt), HasSingleExitEdge(R.getExitingBlock()), DC(DC),
       ORE(ORE), Affinator(this, LI), ID(ID) {
 
   // Options defaults that are different from ISL's.
diff --git a/polly/lib/Support/ScopHelper.cpp b/polly/lib/Support/ScopHelper.cpp
index f9dbdb9..ec9155e 100644
--- a/polly/lib/Support/ScopHelper.cpp
+++ b/polly/lib/Support/ScopHelper.cpp
@@ -703,7 +703,7 @@ static Optional<const MDOperand *> findNamedMetadataArg(MDNode *LoopID,
                                                         StringRef Name) {
   MDNode *MD = findNamedMetadataNode(LoopID, Name);
   if (!MD)
-    return None;
+    return std::nullopt;
   switch (MD->getNumOperands()) {
   case 1:
     return nullptr;
@@ -718,7 +718,7 @@ Optional<Metadata *> polly::findMetadataOperand(MDNode *LoopMD,
                                                 StringRef Name) {
   MDNode *MD = findNamedMetadataNode(LoopMD, Name);
   if (!MD)
-    return None;
+    return std::nullopt;
   switch (MD->getNumOperands()) {
   case 1:
     return nullptr;
@@ -733,7 +733,7 @@ static Optional<bool> getOptionalBoolLoopAttribute(MDNode *LoopID,
                                                    StringRef Name) {
   MDNode *MD = findNamedMetadataNode(LoopID, Name);
   if (!MD)
-    return None;
+    return std::nullopt;
   switch (MD->getNumOperands()) {
   case 1:
     return true;
@@ -755,11 +755,11 @@ llvm::Optional<int> polly::getOptionalIntLoopAttribute(MDNode *LoopID,
   const MDOperand *AttrMD =
       findNamedMetadataArg(LoopID, Name).value_or(nullptr);
   if (!AttrMD)
-    return None;
+    return std::nullopt;
 
   ConstantInt *IntMD = mdconst::extract_or_null<ConstantInt>(AttrMD->get());
   if (!IntMD)
-    return None;
+    return std::nullopt;
 
   return IntMD->getSExtValue();
 }