clang-format: Fix formatting of class template declaration.

Before:
  template <class R, class C>
  struct Aaaaaaaaaaaaaaaaa<R (C::*)(int)
                           const> : Aaaaaaaaaaaaaaaaa<R (C::*)(int)> {};

After:
  template <class R, class C>
  struct Aaaaaaaaaaaaaaaaa<R (C::*)(int) const>
      : Aaaaaaaaaaaaaaaaa<R (C::*)(int)> {};

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201424 91177308-0d34-0410-b5e6-96231b3b80d8