[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
