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

[Bruno Cardoso Lopes via cfe-commits]

bcardosolopes wrote:

@HendrikHuebner once this is updated and pass tests let me know and I'll do one round of review

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