[llvm] [SimplifyCFG] Delete the unnecessary range check for small mask operation (PR #65835)

[via llvm-commits]

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@@ -6545,6 +6544,17 @@ static bool SwitchToLookupTable(SwitchInst *SI, IRBuilder<> &Builder,
 
   BranchInst *RangeCheckBranch = nullptr;
 
+  if (UseSwitchConditionAsTableIndex) {
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zmodem wrote:

Thanks for the update!

For the commit message, I'd skip the godbolt link since that example is different. Also the text says it grows the table to the next pow2 value, which I don't think is true -- it grows it to the maximum index value, which doesn't have to be a power of two.

https://github.com/llvm/llvm-project/pull/65835