[llvm] [SelectionDAG] Add ISD::ARITH_FENCE to SelectionDAGDumper. (PR #225485)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

We seem to have no consistency on CamelCase or snake_case in node naming. I've gone with CamelCase to match the nearby nodes, but happy to change.

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Full diff: https://github.com/llvm/llvm-project/pull/225485.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp (+1) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
index 32e0cafd9f71c..8bc1707b47b31 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
@@ -87,6 +87,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
   case ISD::DELETED_NODE:               return "<<Deleted Node!>>";
 #endif
   case ISD::PREFETCH:                   return "Prefetch";
+  case ISD::ARITH_FENCE:                return "ArithFence";
   case ISD::MEMBARRIER:                 return "MemBarrier";
   case ISD::ATOMIC_FENCE:               return "AtomicFence";
   case ISD::ATOMIC_CMP_SWAP:            return "AtomicCmpSwap";

``````````

</details>


https://github.com/llvm/llvm-project/pull/225485