[llvm] [CGP] Split off switch cases with 0 and another power-of-2 const. (PR #139321)

[Florian Hahn via llvm-commits]

fhahn wrote:

> The SwitchLowering approach makes sense to me.

Thanks, closing this one in favor of https://github.com/llvm/llvm-project/pull/139736

https://github.com/llvm/llvm-project/pull/139321