[clang] [Sema] Diagnose by-value copy constructors in template instantiations (PR #130866)

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https://github.com/cor3ntin commented:

Thanks for working on this 

Can you add a changelog entry in clang/docs/ReleaseNotes.rst (in the bug fixes to c++ section)?

Thanks

https://github.com/llvm/llvm-project/pull/130866