[llvm] Use std::bool_constant (NFC) (#158520)

This patch replaces, std::integral_constant<bool, ...> with
std::bool_constant for brevity.  Note that std::bool_constant was
introduced as part of C++17.

There are cases where we could replace EXPECT_EQ(false, ...) with
EXPECT_FALSE(...), but I'm not doing that in this patch to avoid doing
multiple things in one patch.

1 files changed, 2 insertions, 3 deletions

diff --git a/llvm/unittests/ADT/StringRefTest.cpp b/llvm/unittests/ADT/StringRefTest.cpp
index d5f8dc4..1ace29e 100644
--- a/llvm/unittests/ADT/StringRefTest.cpp
+++ b/llvm/unittests/ADT/StringRefTest.cpp
@@ -1124,14 +1124,13 @@ TEST(StringRefTest, StringLiteral) {
   constexpr StringRef StringRefs[] = {"Foo", "Bar"};
   EXPECT_EQ(StringRef("Foo"), StringRefs[0]);
   EXPECT_EQ(3u, (std::integral_constant<size_t, StringRefs[0].size()>::value));
-  EXPECT_EQ(false,
-            (std::integral_constant<bool, StringRefs[0].empty()>::value));
+  EXPECT_EQ(false, (std::bool_constant<StringRefs[0].empty()>::value));
   EXPECT_EQ(StringRef("Bar"), StringRefs[1]);
 
   constexpr StringLiteral Strings[] = {"Foo", "Bar"};
   EXPECT_EQ(StringRef("Foo"), Strings[0]);
   EXPECT_EQ(3u, (std::integral_constant<size_t, Strings[0].size()>::value));
-  EXPECT_EQ(false, (std::integral_constant<bool, Strings[0].empty()>::value));
+  EXPECT_EQ(false, (std::bool_constant<Strings[0].empty()>::value));
   EXPECT_EQ(StringRef("Bar"), Strings[1]);
 }