[clangd] Fix use-after-free in ArgStripper

#include "clang/Tooling/ArgumentsAdjusters.h"

#include "clang/Tooling/CompilationDatabase.h"

#include "llvm/ADT/StringMap.h"

#include <deque>

#include <string>

#include <vector>

  const Rule *matchingRule(llvm::StringRef Arg, unsigned Mode,

                           unsigned &ArgCount) const;

  llvm::SmallVector<Rule, 4> Rules;

  std::vector<std::string> Storage; // Store strings not found in option table.

  std::deque<std::string> Storage; // Store strings not found in option table.

};

} // namespace clangd