[llvm] [GlobalIsel] Combine G_ADD and G_SUB with constants (PR #97771)

[Amara Emerson via llvm-commits]

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aemerson wrote:

This is a common pattern and it's good if we can wholesale remove unnecessary optional checks across multiple combines by adding an API to do exactly what we want.

https://github.com/llvm/llvm-project/pull/97771