[clang] [Clang][Sema]: Allow copy constructor side effects (PR #81127)

[Vinayak Dev via cfe-commits]

vinayakdsci wrote:

Sorry about the pings, I think I got a little ahead of myself there.
But for C++11, we got to the conclusion that copy elision gives different behaviour for C++17 and later and thus different diagnostics?
In case I made a mistake, I'd be very happy to fix it.

Thanks
P.S. Sorry about the pings, please forgive me.

https://github.com/llvm/llvm-project/pull/81127