[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, 4 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
index 571ce33..a3af1fa 100644
--- a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
+++ b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
@@ -2342,7 +2342,7 @@ struct AAICVTracker : public StateWrapper<BooleanState, AbstractAttribute> {
   virtual Optional<Value *> getReplacementValue(InternalControlVar ICV,
                                                 const Instruction *I,
                                                 Attributor &A) const {
-    return None;
+    return std::nullopt;
   }
 
   /// Return an assumed unique ICV value if a single candidate is found. If
@@ -2447,7 +2447,7 @@ struct AAICVTrackerFunction : public AAICVTracker {
     const auto *CB = dyn_cast<CallBase>(&I);
     if (!CB || CB->hasFnAttr("no_openmp") ||
         CB->hasFnAttr("no_openmp_routines"))
-      return None;
+      return std::nullopt;
 
     auto &OMPInfoCache = static_cast<OMPInformationCache &>(A.getInfoCache());
     auto &GetterRFI = OMPInfoCache.RFIs[OMPInfoCache.ICVs[ICV].Getter];
@@ -2458,7 +2458,7 @@ struct AAICVTrackerFunction : public AAICVTracker {
     if (CalledFunction == nullptr)
       return nullptr;
     if (CalledFunction == GetterRFI.Declaration)
-      return None;
+      return std::nullopt;
     if (CalledFunction == SetterRFI.Declaration) {
       if (ICVReplacementValuesMap[ICV].count(&I))
         return ICVReplacementValuesMap[ICV].lookup(&I);
@@ -2487,7 +2487,7 @@ struct AAICVTrackerFunction : public AAICVTracker {
   // We don't check unique value for a function, so return None.
   Optional<Value *>
   getUniqueReplacementValue(InternalControlVar ICV) const override {
-    return None;
+    return std::nullopt;
   }
 
   /// Return the value with which \p I can be replaced for specific \p ICV.