[clang] typeid() can only be used with <typeinfo>

When compiling a translation unit that calls the `typeid()` operator, the compiler will compile the file only if `` is `#include`d. It will not compile when using `import std;` (or any module that re-exports `std::type_info`), for example, without any `#include `.

I imagine this is not intended, as [cppreference](https://en.cppreference.com/w/cpp/language/typeid.html) states that a program is ill-informed if it calls `typeid()` without `std::type_info` being visible, if a translation imports a module that re-exports `std::type_info`, it should in theory still work, yet it does not.