[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, 3 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
index db7a6d5..84adb6a 100644
--- a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
@@ -1042,9 +1042,8 @@ class WidenIV {
                                               Instruction *UseI) {
     DefUserPair Key(Def, UseI);
     auto It = PostIncRangeInfos.find(Key);
-    return It == PostIncRangeInfos.end()
-               ? Optional<ConstantRange>(None)
-               : Optional<ConstantRange>(It->second);
+    return It == PostIncRangeInfos.end() ? Optional<ConstantRange>(std::nullopt)
+                                         : Optional<ConstantRange>(It->second);
   }
 
   void calculatePostIncRanges(PHINode *OrigPhi);