[clang] [clang] fix merging of UsingShadowDecl (PR #80245)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> The issue is up: #80252

Thanks. Although I feel it is too implementor's view, (I mean the end users can hardly understand it), it is much better.

> Yeah, looking at the similarities, there is a decent chance this is the same issue, it's worth trying it out.

Yeah, let's give it a try.


https://github.com/llvm/llvm-project/pull/80245