-Wreturn-stack-address false positive

[hokein]

https://gcc.godbolt.org/z/aMzvxerna

struct [[gsl::Pointer]] view {};
struct S {
    view s;
};
struct [[gsl::Owner]] Q {
    const S* get() const [[clang::lifetimebound]];
};
view g(view b, int c) {
    return c > 1 ? Q().get()->s : b;
}

[hokein]

If we remove the ternary operator, the diagnostic is gone, which is expected:

struct [[gsl::Pointer]] view {};
struct S {
    view s;
};
struct [[gsl::Owner]] Q {
    const S* get() const [[clang::lifetimebound]];
};
view g(view b, int c) {
  return Q().get()->s; // no diagnostic, good.
}

We have a special handling to filter out this case: https://github.com/llvm/llvm-project/blob/main/clang/lib/Sema/CheckExprLifetime.cpp#L581-L584. However, the logic only works for if the Arg is a form of member expr (e.g. base.ptr).