[clang] [LifetimeSafety] Implicit lifetimebound only for accessor methods of GSL owners (PR #174741)

[Utkarsh Saxena via cfe-commits]

usx95 wrote:

We were seeing a false positive of the form:
```cpp
const char* get(std::string_view s) { 
  return s.data();
}
```
I have revised the tracking to also make the analysis "see through" the views in such cases.

https://github.com/llvm/llvm-project/pull/174741