[llvm] [X86] Optimized ADD + ADC to ADC (PR #173543)

[Yanzuo Liu via llvm-commits]

zwuis wrote:

> - This PR fixing the https://github.com/llvm/llvm-project/issues/173408 issue.

You could use syntax like `fixes #173408` so that [the issue is automatically closed when the PR is merged](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue).

https://github.com/llvm/llvm-project/pull/173543