[llvm-bugs] [Bug 116961] [Clang] False positive unused private field if defaulted member comparison operator declared out-of-class

[LLVM Bugs via llvm-bugs]

Issue	116961
Summary	[Clang] False positive unused private field if defaulted member comparison operator declared out-of-class
Labels	clang:diagnostics, false-positive
Assignees
Reporter	Maetveis

    Observed:
```c++
class A {
  int used;
  bool operator==(const A&) const;
};

bool A::operator==(const A&) const = default;

class B {
  int used;
 friend bool operator==(const B&, const B&);
};

bool operator==(const B&, const B&) = default;
```

`clang++ -std=c++20 -Wunused-private-field test.cpp`

[Compiler explorer link](https://godbolt.org/z/GnE3fdc45)

```plaintext
<source>:2:7: warning: private field 'used' is not used [-Wunused-private-field]
    2 | int used;
      |       ^
1 warning generated.
Compiler returned: 0
```

Exptected:
No warnings.

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