[clang] [clang-format] Revert "[clang-format][NFC] Delete TT_LambdaArrow (#70… (PR #105923)

[Owen Pan via cfe-commits]

================
@@ -3369,6 +3371,20 @@ TEST_F(TokenAnnotatorTest, GNULanguageStandard) {
   EXPECT_TOKEN(Tokens[2], tok::spaceship, TT_BinaryOperator);
 }
 
+TEST_F(TokenAnnotatorTest, SplitPenalty) {
+  auto Style = getLLVMStyle();
+  Style.ColumnLimit = 20;
+
+  auto Tokens = annotate("class foo {\n"
+                         "  auto bar()\n"
+                         "      -> bool;\n"
+                         "};",
+                         Style);
+  ASSERT_EQ(Tokens.size(), 13u);
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owenca wrote:

```suggestion
  ASSERT_EQ(Tokens.size(), 13u) << Tokens;
```

https://github.com/llvm/llvm-project/pull/105923