Add C++-specific tests to test_type_info and test_lookup_func

[hainest]

Currently, the mutatees are written in C. Check to see if they are ever compiled with C++ and add tests for C++-specific types like references, enum class, etc.

[hainest]

Enum tests:

enum Foo {ONE};
enum class Bar : short {TWO};
typedef enum {THREE} Baz;
typedef Bar Biz;

void foo(Biz fff){}