[clang-tidy] False negative readability-redundant-casting for cast to underlying enum type

[chrchr-github]

#include <cstdint>

enum E : uint8_t { E0, E1 };
void g(uint8_t);

void f(uint8_t u, E e) {
    g((uint8_t)e); // FN

    g((uint8_t)u); // warning
}

https://godbolt.org/z/7Gcjrj64c