[clang-tidy] [false-positive] performance-move-const-arg

[schaumb]

The current check falsely tries to remove the std::move when the return value is a rvalue reference type.

An example:

struct A {};
struct B {
  operator A&&() const {
    static A a;
    return std::move(a); // Clang-Tidy: Std::move of the variable 'a' of the trivially-copyable type 'A' has no effect; remove std::move() 
  }
};