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

[Matt Arsenault via llvm-commits]

================
@@ -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,
----------------
arsenm wrote:

```suggestion
static SDValue performREMCombineGeneric(SDNode *N, DAGCombiner &DC,
```

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