[clang] [clang][test] add TestLanguage.def to specify all tested language versions (PR #94243)

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``````````bash
git-clang-format --diff b301a98b33d75813d73838c1bd4c47024d044af6 ab818f8bea394662ccec4e686db79401d003bd37 -- clang/include/clang/Testing/CommandLineArgs.h clang/include/clang/Testing/TestClangConfig.h clang/lib/Testing/CommandLineArgs.cpp clang/unittests/AST/MatchVerifier.h clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp clang/unittests/Tooling/Syntax/BuildTreeTest.cpp clang/unittests/Tooling/Syntax/MutationsTest.cpp clang/unittests/Tooling/Syntax/SynthesisTest.cpp clang/unittests/Tooling/Syntax/TreeTest.cpp clang/unittests/Tooling/Syntax/TreeTestBase.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/unittests/AST/MatchVerifier.h b/clang/unittests/AST/MatchVerifier.h
index 4a574e3242..8bda039863 100644
--- a/clang/unittests/AST/MatchVerifier.h
+++ b/clang/unittests/AST/MatchVerifier.h
@@ -88,7 +88,7 @@ MatchVerifier<NodeType>::match(const std::string &Code,
 
   StringRef FileName;
   switch (L) {
-#define TESTLANGUAGE(lang, version, std_flag, version_index)                                  \
+#define TESTLANGUAGE(lang, version, std_flag, version_index)                   \
   case Lang_##lang##version:                                                   \
     Args.push_back("-std=" #std_flag);                                         \
     FileName = getFilenameForTesting(Lang_##lang##version);                    \

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https://github.com/llvm/llvm-project/pull/94243