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

[Amara Emerson via llvm-commits]

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aemerson wrote:

I did a build of CTMark with -Os and I don't see any change. What's motivating your patches here? Is there some benchmark that's getting better? Our work should be targeting closing our gap to SelectionDAG so that we can enable it by default.

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