[LifetimeSafety] Suggest annotation for returning object with a pointer

```c++
struct A {
int* ptr;
};
A Foo(int* ptr) {
return {ptr};
}
```

Expected the following warning when using `-Wlifetime-safety -Wlifetime-safety-suggestions`: `parameter ... should be marked [[clang::lifetimebound]]`. Actual result on ToT - no warnings.

Start with the inline C++ reproducer and run it on ToT using -Wlifetime-safety -Wlifetime-safety-suggestions. Trace the lifetime-safety diagnostic path for functions returning an object containing a pointer; done means the parameter is suggested for [[clang::lifetimebound]] and the existing behavior is covered by a regression test.

Written by the indexing model from the issue text.