[clang] [Clang] Clean up the fix for deferred access checking (PR #141340)

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cor3ntin wrote:

Thanks for this PR.
I'd like CWG to weigh in on the core issue I submitted here  https://github.com/cplusplus/CWG/issues/709
Several people have expressed that they expect Clang's (non-conforming) behavior. WDYT?

https://github.com/llvm/llvm-project/pull/141340