Fix the uninitlaized ExpandTokPastingArg option

[SjMxr233]

When I call the ParseTranslationUnit and GetDiagnostic interfaces of dxcisense to obtain diagnostic information, the ExpandTokPastingArg is not properly initialized during the pipeline. This results in undefined behavior due to reading the uninitialized value, making token-pasting indeterminate.

[github-actions]

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

You can test this locally with the following command:

git-clang-format --diff dc85cd71e2be16cd1b1e91507cf78d55032d32f2 2126ace887ed241c002749bfa7198b1e4f2111e6 -- tools/clang/include/clang/Lex/PreprocessorOptions.h

View the diff from clang-format here.

diff --git a/tools/clang/include/clang/Lex/PreprocessorOptions.h b/tools/clang/include/clang/Lex/PreprocessorOptions.h
index fe688e8b..84ebde0c 100644
--- a/tools/clang/include/clang/Lex/PreprocessorOptions.h
+++ b/tools/clang/include/clang/Lex/PreprocessorOptions.h
@@ -147,16 +147,14 @@ public:
   IntrusiveRefCntPtr<FailedModulesSet> FailedModules;
 
 public:
-  PreprocessorOptions() : UsePredefines(true), DetailedRecord(false),
-                          IgnoreLineDirectives(false), // HLSL Change - ignore line directives.
-                          ExpandTokPastingArg(false), // HLSL Change - allow pre-expand
-                          DisablePCHValidation(false),
-                          AllowPCHWithCompilerErrors(false),
-                          DumpDeserializedPCHDecls(false),
-                          PrecompiledPreambleBytes(0, true),
-                          RemappedFilesKeepOriginalName(true),
-                          RetainRemappedFileBuffers(false),
-                          ObjCXXARCStandardLibrary(ARCXX_nolib) { }
+  PreprocessorOptions()
+      : UsePredefines(true), DetailedRecord(false),
+        IgnoreLineDirectives(false), // HLSL Change - ignore line directives.
+        ExpandTokPastingArg(false),  // HLSL Change - allow pre-expand
+        DisablePCHValidation(false), AllowPCHWithCompilerErrors(false),
+        DumpDeserializedPCHDecls(false), PrecompiledPreambleBytes(0, true),
+        RemappedFilesKeepOriginalName(true), RetainRemappedFileBuffers(false),
+        ObjCXXARCStandardLibrary(ARCXX_nolib) {}
 
   void addMacroDef(StringRef Name) { Macros.emplace_back(Name, false); }
   void addMacroUndef(StringRef Name) { Macros.emplace_back(Name, true); }

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