[clang] Reland [C++20] [Modules] [Itanium ABI] Generate the vtable in the mod… (PR #102287)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

/cherry-pick 847f9cb0e868c8ec34f9aa86fdf846f8c4e0388b

https://github.com/llvm/llvm-project/pull/102287
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