[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/ADT/APIntTest.cpp b/llvm/unittests/ADT/APIntTest.cpp
index 3dba0fa..c5a9859 100644
--- a/llvm/unittests/ADT/APIntTest.cpp
+++ b/llvm/unittests/ADT/APIntTest.cpp
@@ -2932,10 +2932,10 @@ TEST(APIntTest, MultiplicativeInverseExaustive) {
 
 TEST(APIntTest, GetMostSignificantDifferentBit) {
   EXPECT_EQ(APIntOps::GetMostSignificantDifferentBit(APInt(8, 0), APInt(8, 0)),
-            llvm::None);
+            std::nullopt);
   EXPECT_EQ(
       APIntOps::GetMostSignificantDifferentBit(APInt(8, 42), APInt(8, 42)),
-      llvm::None);
+      std::nullopt);
   EXPECT_EQ(*APIntOps::GetMostSignificantDifferentBit(APInt(8, 0), APInt(8, 1)),
             0u);
   EXPECT_EQ(*APIntOps::GetMostSignificantDifferentBit(APInt(8, 0), APInt(8, 2)),
@@ -2945,7 +2945,7 @@ TEST(APIntTest, GetMostSignificantDifferentBit) {
   EXPECT_EQ(*APIntOps::GetMostSignificantDifferentBit(APInt(8, 1), APInt(8, 0)),
             0u);
   EXPECT_EQ(APIntOps::GetMostSignificantDifferentBit(APInt(8, 1), APInt(8, 1)),
-            llvm::None);
+            std::nullopt);
   EXPECT_EQ(*APIntOps::GetMostSignificantDifferentBit(APInt(8, 1), APInt(8, 2)),
             1u);
   EXPECT_EQ(*APIntOps::GetMostSignificantDifferentBit(APInt(8, 1), APInt(8, 3)),
@@ -2960,7 +2960,7 @@ TEST(APIntTest, GetMostSignificantDifferentBitExaustive) {
       [](const APInt &V0, const APInt &V1) -> llvm::Optional<unsigned> {
     assert(V0.getBitWidth() == V1.getBitWidth() && "Must have same bitwidth");
     if (V0 == V1)
-      return llvm::None; // Bitwise identical.
+      return std::nullopt; // Bitwise identical.
     // There is a mismatch. Let's find the most significant different bit.
     for (int Bit = V0.getBitWidth() - 1; Bit >= 0; --Bit) {
       if (V0[Bit] == V1[Bit])