[llvm] [DAGCombiner, NVPTX] Port 'rem' custom combine from NVPTX to generic combiner (PR #167147)

[Matt Arsenault via llvm-commits]

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@@ -900,6 +900,41 @@ namespace {
                          ISD::NodeType ExtType);
   };
 
+/// Generic remainder optimization : Folds a remainder operation (A % B) by reusing the computed quotient (A / B).
+static SDValue PerformREMCombineGeneric(SDNode *N, DAGCombiner &DC,
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arsenm wrote:

Passing in DAGCombiner is strange, pass in the DAG and TLI, or just move to be a DAGCombiner member? 

https://github.com/llvm/llvm-project/pull/167147