[clang] [CIR] Lower calls to trivial copy constructor to cir::CopyOp (PR #168281)

[Hendrik Hübner via cfe-commits]

HendrikHuebner wrote:

View the diff without the previous PR [here](https://github.com/llvm/llvm-project/pull/168281/commits/afa84ef160c6f3f58cd65eb08f8d883d336e3111)

Right now a bunch of tests are failing, but it will take quite a while to fix them all, so before I spend 2 hours+ doing that let me know your thoughts on this. Do we also want to replace trivial copy assignment operators?

https://github.com/llvm/llvm-project/pull/168281