[llvm] [GlobalISel] Introduce LLT:token() as a special scalar type (PR #85189)

[Matt Arsenault via llvm-commits]

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@@ -18,6 +18,28 @@ using namespace llvm;
 
 namespace {
 
+TEST(LowLevelTypeTest, Token) {
+  LLVMContext C;
+  DataLayout DL("");
+
+  const LLT TTy = LLT::token();
+
+  // Test kind.
+  ASSERT_TRUE(TTy.isValid());
+  ASSERT_TRUE(TTy.isScalar());
+  ASSERT_TRUE(TTy.isToken());
+
+  ASSERT_FALSE(TTy.isPointer());
+  ASSERT_FALSE(TTy.isVector());
+
+  const LLT STy = LLT::scalar(0);
+  ASSERT_TRUE(STy == TTy);
+
+  // Test equality operators.
+  EXPECT_TRUE(TTy == TTy);
+  EXPECT_FALSE(TTy != TTy);
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arsenm wrote:

EXPECT_EQ/EXPECT_NE 

https://github.com/llvm/llvm-project/pull/85189