[clang] [MS-ABI] create unique vftable name for vftable defined with internal alias. (PR #71748)

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jyu2-git wrote:

> I see unrelated changes on the branch? Otherwise LGTM

This my first time using this new review.  I need merge them in.  I revert my first change add new one.  But it seems it is not merged.

https://github.com/llvm/llvm-project/pull/71748