[CIR] Lower calls to trivial copy constructor to cir::CopyOp (#168281)
This PR is a follow up to #167975 and replaces calls to trivial copy
constructors with `cir::CopyOp`.
---------
Co-authored-by: Andy Kaylor <akaylor@nvidia.com>
Co-authored-by: Henrich Lauko <henrich.lau@gmail.com>