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

[Amara Emerson via llvm-commits]

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aemerson wrote:

I put an assert into the combine to see when it fires. Essentially across the whole test suite I only see it hit in the MultiSource build variant of sqlite3 once, which saves 4 bytes across ~3.5k binaries. I will approve this but I really think it's not a good use of time to pursue this. If anything this might indicate we should *remove* these combines from SDAG for compile time reasons.

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