[clang] [Clang] Fix crash on malformed std::partial_ordering static members (PR #172001)

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code-pankaj wrote:

@tbaederr @zwuis Thanks for the Review!

I have updated the PR based on the feedback. I moved the fix to `ComparisonCategoryInfo::lookupValueInfo` to enforce strict type checking on the static members. This ensures we reject malformed types (like `int`) immediately with a proper "member missing" error.

I have also added the test and the Release Note entry.

Please let me know if anything else is needed!

https://github.com/llvm/llvm-project/pull/172001