[llvm-bugs] [Bug 133720] [Clang][Regression:20][Modules] Name lookup failed to find hidden friend in non-exported base class

[LLVM Bugs via llvm-bugs]

Issue	133720
Summary	[Clang][Regression:20][Modules] Name lookup failed to find hidden friend in non-exported base class
Labels	clang
Assignees
Reporter	MagentaTreehouse

    m.cppm
```c++
export module m;
struct Base {
    template <class T>
    friend constexpr auto f(T) { return 0; }
};
export struct A: Base {};
```

main.cpp
```c++
import m;
int main() {
 f(A{});
}
```

See https://compiler-explorer.com/z/v4xdnT7eW.

Error since Clang 20:
```console
main.cpp:3:5: error: use of undeclared identifier 'f'
    3 |     f(A{});
      |     ^
```

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