message: [ClangASTContext] Remove unused functions [swift-lldb only].
  Another step to reduce the diff between upstream and github.
diff: @@ -1416,30 +1416,6 @@ ClangASTContext::GetTranslationUnitDecl(clang::ASTContext *ast) {
  return ast->getTranslationUnitDecl();
  }
  -CompilerType ClangASTContext::CopyType(const CompilerType &src) {
  - clang::ASTContext *dst_clang_ast = getASTContext();
  - if (dst_clang_ast) {
  - FileSystemOptions file_system_options;
  - ClangASTContext *src_ast =
  - llvm::dyn_cast_or_null<ClangASTContext>(src.GetTypeSystem());
  - if (src_ast) {
  - clang::ASTContext *src_clang_ast = src_ast->getASTContext();
  - if (src_clang_ast) {
  - if (src_clang_ast == dst_clang_ast)
  - return src; // We already are in the right AST, no need to copy
  - else {
  - FileManager file_manager(file_system_options);
  - ASTImporter importer(*dst_clang_ast, file_manager, *src_clang_ast,
  - file_manager, false);
  - QualType dst_qual_type(importer.Import(ClangUtil::GetQualType(src)));
  - return CompilerType(this, dst_qual_type.getAsOpaquePtr());
  - }
  - }
  - }
  - }
  - return CompilerType();
  -}
  -
  clang::Decl *ClangASTContext::CopyDecl(ASTContext *dst_ast, ASTContext *src_ast,
  clang::Decl *source_decl) {
  FileSystemOptions file_system_options;
  @@ -5069,15 +5045,6 @@ ClangASTContext::GetUnboundType(lldb::opaque_compiler_type_t type) {
  return CompilerType(getASTContext(), GetQualType(type));
  }
  -CompilerType ClangASTContext::RemoveFastQualifiers(const CompilerType &type) {
  - if (ClangUtil::IsClangType(type)) {
  - clang::QualType qual_type(ClangUtil::GetQualType(type));
  - qual_type.getQualifiers().removeFastQualifiers();
  - return CompilerType(type.GetTypeSystem(), qual_type.getAsOpaquePtr());
  - }
  - return type;
  -}
  -
  //----------------------------------------------------------------------
  // Create related types using the current type's AST
  //----------------------------------------------------------------------
  