[clang] [CIR] Handle missing member pointer initializers (PR #235267)

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cs24btech11025 wrote:

I've read the LLVM contribution policies, including the AI Tool Use Policy, Code Review Policy and Practices, and Developer Policy. I've disclosed the AI assistance used in the PR description, reviewed the patch and test results, and take responsibility for this contribution.

https://github.com/llvm/llvm-project/pull/235267