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

[Amara Emerson via llvm-commits]

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aemerson wrote:

Perhaps instead of `getIConstantFromReg()` we have something like `getKnownIConstantFromReg()`? So it's clear from the name that it's expecting a guaranteed constant and can therefore safely assert inside. But I'll leave the naming to your judgement.

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