[clang] [clang] Fix constant evaluation of member pointer access into sibling class. (PR #150829)

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keinflue wrote:

@erichkeane Thank you.

I realized that both issues fixed by this PR are still present in similar form if `-fexperimental-new-constant-interpreter` is used (and similar issues in even more scenarios with that option).

Given that the option is experimental, is this expected to work at the moment? Should that be a new issue or should the issues be reopened?

https://github.com/llvm/llvm-project/pull/150829