[clang] Add option to generate additional debug info for expression dereferencing pointer to pointers. (PR #81545)

[Namhyung Kim via cfe-commits]

namhyung wrote:

Also I think it generates variables for destination of pointers, not the source.  For example, if we have `a->b->c`, what we need is variables for `a` and `b`.  Usually it would already have one for `a`, so it can skip generating it (unless there's a difference like due to type cases), and it'd be enough to just generate one for `b`.

https://github.com/llvm/llvm-project/pull/81545