[clang] [clang] Hide the `LangOptions` pointer from `CompilerInvocation` (PR #137675)

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


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

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- clang/include/clang/Frontend/ASTUnit.h clang/include/clang/Frontend/CompilerInstance.h clang/include/clang/Frontend/CompilerInvocation.h clang/lib/Frontend/ASTUnit.cpp clang/lib/Frontend/FrontendAction.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Frontend/ASTUnit.h b/clang/include/clang/Frontend/ASTUnit.h
index 73686b0ea..ac99f0fb2 100644
--- a/clang/include/clang/Frontend/ASTUnit.h
+++ b/clang/include/clang/Frontend/ASTUnit.h
@@ -698,19 +698,17 @@ public:
   /// lifetime is expected to extend past that of the returned ASTUnit.
   ///
   /// \returns - The initialized ASTUnit or null if the AST failed to load.
-  static std::unique_ptr<ASTUnit>
-  LoadFromASTFile(StringRef Filename, const PCHContainerReader &PCHContainerRdr,
-                  WhatToLoad ToLoad,
-                  IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
-                  const FileSystemOptions &FileSystemOpts,
-                  const HeaderSearchOptions &HSOpts,
-                  const LangOptions *LangOpts = nullptr,
-                  bool OnlyLocalDecls = false,
-                  CaptureDiagsKind CaptureDiagnostics = CaptureDiagsKind::None,
-                  bool AllowASTWithCompilerErrors = false,
-                  bool UserFilesAreVolatile = false,
-                  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
-                      llvm::vfs::getRealFileSystem());
+  static std::unique_ptr<ASTUnit> LoadFromASTFile(
+      StringRef Filename, const PCHContainerReader &PCHContainerRdr,
+      WhatToLoad ToLoad, IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
+      const FileSystemOptions &FileSystemOpts,
+      const HeaderSearchOptions &HSOpts, const LangOptions *LangOpts = nullptr,
+      bool OnlyLocalDecls = false,
+      CaptureDiagsKind CaptureDiagnostics = CaptureDiagsKind::None,
+      bool AllowASTWithCompilerErrors = false,
+      bool UserFilesAreVolatile = false,
+      IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
+          llvm::vfs::getRealFileSystem());
 
 private:
   /// Helper function for \c LoadFromCompilerInvocation() and

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https://github.com/llvm/llvm-project/pull/137675