[clang] Fix MSVC build after #206326 (again) (PR #207335)

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github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/unittests/Basic/DiagnosticTest.cpp --diff_from_common_commit
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/unittests/Basic/DiagnosticTest.cpp b/clang/unittests/Basic/DiagnosticTest.cpp
index 146673588..0ed282cf3 100644
--- a/clang/unittests/Basic/DiagnosticTest.cpp
+++ b/clang/unittests/Basic/DiagnosticTest.cpp
@@ -452,7 +452,7 @@ TEST_F(SuppressionMappingTest, CanonicalizesSlashesOnWindows) {
 TEST(DisplayCodePointForDiagnosticTest, printableDisplaysQuoted) {
   EXPECT_EQ(DisplayCodePointForDiagnostic(U'A'), "'A' U+0041");
   // This test fails when msvc is not using /utf-8.
-  //EXPECT_EQ(DisplayCodePointForDiagnostic(U'🤡'), "'🤡' U+1F921");
+  // EXPECT_EQ(DisplayCodePointForDiagnostic(U'🤡'), "'🤡' U+1F921");
   EXPECT_EQ(DisplayCodePointForDiagnostic(U' '), "' ' U+0020");
 }
 

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https://github.com/llvm/llvm-project/pull/207335