[clang-include-cleaner] Invalid fix-it: required header for using declaration not included

~~~c++
#include
using std::end;
std::size_t n;
~~~
With `-fix`, `` is replaced with ``, which breaks compilation.
A correct fix is generated for e.g. `` (`#include ` gets added).
https://godbolt.org/z/P9Gqfjcs1