[llvm] [Coroutines][Swift] Remove replaceSwiftErrorOps while cloning (PR #116292)

[John McCall via llvm-commits]

rjmccall wrote:

I don't think you can reliably detect when Swift is being used.  Clang supports the `swiftcall` calling convention in many common targets, and somebody could call a function that takes a `swifterror` argument from a C++ coroutine.  For better or worse, `swifterror` is a generic LLVM IR feature orthogonal to the choice of coroutine ABI, so even if we abstracted out the coroutine ABI lowering details, we'd still need `swifterror` support here.

https://github.com/llvm/llvm-project/pull/116292