[clang-tidy] Check request: bugprone-unreached-function-overload

[denzor200]

template<typename T>
void foo(T x) { std::cout << "Template: " << x << "\n"; }

int main() {
    foo(42);      // OK: `Template: 42`
    foo("hello"); // BAD: `Template: hello` (`const char*: hello` expected)
}

// defined after it's being used
void foo(const char* s) { std::cout << "const char*: " << s << "\n"; }

Possible fix is to declare foo(const char* s) before main function.
Another fix is to move foo(const char* s) definition before main function.

The idea for this check was inspired by the article by @akrzemi1.

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: Denis Mikhailov (denzor200)

``` template<typename T> void foo(T x) { std::cout << "Template: " << x << "\n"; }

int main() {
foo(42); // OK: Template: 42
foo("hello"); // BAD: Template: hello (const char*: hello expected)
}

// defined after it's being used
void foo(const char* s) { std::cout << "const char*: " << s << "\n"; }

Possible fix is to declare `foo(const char* s)` before `main` function.
Another fix is to move `foo(const char* s)` definition before `main` function.

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