[llvm] [X86] Optimized ADC + ADD to ADC (PR #176713)

[via llvm-commits]

JaydeepChauhan14 wrote:

> Can you split the commit into 2 commits within the PR? One that adds tests with the existing codegen, and one that changes X86ISelLowering.cpp and updates the tests to show the new codegen. Then reviewers can review each commit individually within the PR to see how the output changes.

Sure

https://github.com/llvm/llvm-project/pull/176713