[llvm] [SimplifyCFG] Add optimization for switches of powers of two (PR #70977)

[Yingwei Zheng via llvm-commits]

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@@ -6839,6 +6836,73 @@ static bool ReduceSwitchRange(SwitchInst *SI, IRBuilder<> &Builder,
   return true;
 }
 
+static bool simplifySwitchOfPowersOfTwo(SwitchInst *SI, IRBuilder<> &Builder,
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dtcxzyw wrote:

Could you please add some head comments like `ReduceSwitchRange`?

https://github.com/llvm/llvm-project/pull/70977