[llvm] [LLVM] Add `LLVMIntrinsicCopyName` to LLVM C API (PR #112197)

[Rahul Joshi via llvm-commits]

jurahul wrote:

Failures look like existing regressions. I'll rebase to get clean checks again, but wanted to start review.

https://github.com/llvm/llvm-project/pull/112197