[SPARC][IAS] Add GNU extension for `addc`

Transform `addc imm, %rs, %rd` into `addc %rs, imm, %rd`.
This is used in some GNU and Linux code.

Reviewers: s-barannikov, rorth, jrtc27, brad0

Reviewed By: s-barannikov

Pull Request: https://github.com/llvm/llvm-project/pull/94245