clang-format: Improve && detection as binary operator.

Before:
  template <class T,
            class = typename ::std::enable_if<
                ::std::is_array<T>{}&& ::std::is_array<T>{}>::type>
  void F();

After:
  template <class T,
            class = typename ::std::enable_if<
                ::std::is_array<T>{} && ::std::is_array<T>{}>::type>
  void F();

llvm-svn: 220813