[llvm/unittests] 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/unittests/Analysis/ScalarEvolutionTest.cpp b/llvm/unittests/Analysis/ScalarEvolutionTest.cpp
index 3e02fc7..1470822 100644
--- a/llvm/unittests/Analysis/ScalarEvolutionTest.cpp
+++ b/llvm/unittests/Analysis/ScalarEvolutionTest.cpp
@@ -1151,7 +1151,7 @@ TEST_F(ScalarEvolutionsTest, SCEVComputeConstantDifference) {
     auto diff = [&SE](const SCEV *LHS, const SCEV *RHS) -> Optional<int> {
       auto ConstantDiffOrNone = computeConstantDifference(SE, LHS, RHS);
       if (!ConstantDiffOrNone)
-        return None;
+        return std::nullopt;
 
       auto ExtDiff = ConstantDiffOrNone->getSExtValue();
       int Diff = ExtDiff;
@@ -1170,9 +1170,9 @@ TEST_F(ScalarEvolutionsTest, SCEVComputeConstantDifference) {
     EXPECT_EQ(diff(ScevIV, ScevIVNext), -1);
     EXPECT_EQ(diff(ScevIVNext, ScevIV), 1);
     EXPECT_EQ(diff(ScevIVNext, ScevIVNext), 0);
-    EXPECT_EQ(diff(ScevV0, ScevIV), None);
-    EXPECT_EQ(diff(ScevIVNext, ScevV3), None);
-    EXPECT_EQ(diff(ScevYY, ScevV3), None);
+    EXPECT_EQ(diff(ScevV0, ScevIV), std::nullopt);
+    EXPECT_EQ(diff(ScevIVNext, ScevV3), std::nullopt);
+    EXPECT_EQ(diff(ScevYY, ScevV3), std::nullopt);
   });
 }