[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/LoopPeel.cpp b/llvm/lib/Transforms/Utils/LoopPeel.cpp
index e870409..bfb865a 100644
--- a/llvm/lib/Transforms/Utils/LoopPeel.cpp
+++ b/llvm/lib/Transforms/Utils/LoopPeel.cpp
@@ -165,7 +165,7 @@ public:
 
 protected:
   using PeelCounter = std::optional<unsigned>;
-  const PeelCounter Unknown = None;
+  const PeelCounter Unknown = std::nullopt;
 
   // Add 1 respecting Unknown and return Unknown if result over MaxIterations
   PeelCounter addOne(PeelCounter PC) const {
@@ -250,7 +250,7 @@ Optional<unsigned> PhiAnalyzer::calculateIterationsToPeel() {
     }
   }
   assert((Iterations <= MaxIterations) && "bad result in phi analysis");
-  return Iterations ? Optional<unsigned>(Iterations) : None;
+  return Iterations ? Optional<unsigned>(Iterations) : std::nullopt;
 }
 
 } // unnamed namespace